16644136525 has 12 divisors (see below), whose sum is σ = 20647052512. Its totient is φ = 13309939440.

The previous prime is 16644136493. The next prime is 16644136541. The reversal of 16644136525 is 52563144661.

It is not a de Polignac number, because 16644136525 - 2⁵ = 16644136493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70419 + ... + 195568.

Almost surely, 2^16644136525 is an apocalyptic number.

It is an amenable number.

16644136525 is a deficient number, since it is larger than the sum of its proper divisors (4002915987).

16644136525 is a wasteful number, since it uses less digits than its factorization.

16644136525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268500 (or 268495 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

It can be divided in two parts, 16644136 and 525, that added together give a palindrome (16644661).

The spelling of 16644136525 in words is "sixteen billion, six hundred forty-four million, one hundred thirty-six thousand, five hundred twenty-five".