16531601125 has 64 divisors (see below), whose sum is σ = 23671327680. Its totient is φ = 11486592000.

The previous prime is 16531601123. The next prime is 16531601161. The reversal of 16531601125 is 52110613561.

It is a happy number.

It can be written as a sum of positive squares in 32 ways, for example, as 9802188036 + 6729413089 = 99006^2 + 82033^2 .

It is not a de Polignac number, because 16531601125 - 2¹ = 16531601123 is a prime.

It is a super-2 number, since 2×16531601125² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16531601123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4666855 + ... + 4670395.

It is an arithmetic number, because the mean of its divisors is an integer number (369864495).

Almost surely, 2^16531601125 is an apocalyptic number.

It is an amenable number.

16531601125 is a deficient number, since it is larger than the sum of its proper divisors (7139726555).

16531601125 is an equidigital number, since it uses as much as digits as its factorization.

16531601125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612 (or 3576 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 16531601125 in words is "sixteen billion, five hundred thirty-one million, six hundred one thousand, one hundred twenty-five".