16000040000025 has 135 divisors (see below), whose sum is σ = 29962861700079. Its totient is φ = 8440714550880.

The previous prime is 16000040000023. The next prime is 16000040000041. The reversal of 16000040000025 is 52000004000061.

It is a happy number.

The square root of 16000040000025 is 4000005.

It is a perfect power (a square), and thus also a powerful number.

16000040000025 is a `hidden beast` number, since 1 + 600 + 0 + 0 + 40 + 0 + 0 + 0 + 0 + 25 = 666.

16000040000025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5760014400009 + 10240025600016 = 2400003^2 + 3200004^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 16000040000025 - 2¹ = 16000040000023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16000039999962 and 16000040000007.

It is not an unprimeable number, because it can be changed into a prime (16000040000023) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 18540022744 + ... + 18540023606.

Almost surely, 2^{16000040000025} is an apocalyptic number.

16000040000025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16000040000025 is the 4000005-th square number.

16000040000025 is the 2000003-rd centered octagonal number.

It is an amenable number.

16000040000025 is a deficient number, since it is larger than the sum of its proper divisors (13962821700054).

16000040000025 is an frugal number, since it uses more digits than its factorization.

16000040000025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 16000040000025 its reverse (52000004000061), we get a palindrome (68000044000086).

The spelling of 16000040000025 in words is "sixteen trillion, forty million, twenty-five", and thus it is an aban number and an uban number.