16155681025 has 27 divisors (see below), whose sum is σ = 22029325059. Its totient is φ = 11744502000.

The previous prime is 16155680993. The next prime is 16155681029. The reversal of 16155681025 is 52018655161.

The square root of 16155681025 is 127105.

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

It can be written as a sum of positive squares in only one way, i.e., 5816045169 + 10339635856 = 76263^2 + 101684^2 .

It is not a de Polignac number, because 16155681025 - 2⁵ = 16155680993 is a prime.

It is a super-2 number, since 2×16155681025² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16155681029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6989620 + ... + 6991930.

Almost surely, 2^16155681025 is an apocalyptic number.

16155681025 is the 127105-th square number.

16155681025 is the 63553-rd centered octagonal number.

It is an amenable number.

16155681025 is a deficient number, since it is larger than the sum of its proper divisors (5873644034).

16155681025 is an frugal number, since it uses more digits than its factorization.

16155681025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4654 (or 2327 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 40.

The spelling of 16155681025 in words is "sixteen billion, one hundred fifty-five million, six hundred eighty-one thousand, twenty-five".