15664485636 has 36 divisors (see below), whose sum is σ = 39662277564. Its totient is φ = 5212800000.

The previous prime is 15664485623. The next prime is 15664485653. The reversal of 15664485636 is 63658446651.

15664485636 is a `hidden beast` number, since 1 + 566 + 4 + 48 + 5 + 6 + 36 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9243668736 + 6420816900 = 96144^2 + 80130^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×15664485636² (a number of 21 digits) contains 22 as substring.

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, 340365 + ... + 383636.

Almost surely, 2^15664485636 is an apocalyptic number.

It is an amenable number.

15664485636 is an abundant number, since it is smaller than the sum of its proper divisors (23997791928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15664485636 is a wasteful number, since it uses less digits than its factorization.

15664485636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724612 (or 724607 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The spelling of 15664485636 in words is "fifteen billion, six hundred sixty-four million, four hundred eighty-five thousand, six hundred thirty-six".