15616064644 has 12 divisors (see below), whose sum is σ = 27328989184. Its totient is φ = 7807782024.

The previous prime is 15616064621. The next prime is 15616064687. The reversal of 15616064644 is 44646061651.

It is a happy number.

It is a super-2 number, since 2×15616064644² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15616064644.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203677 + ... + 269659.

Almost surely, 2^15616064644 is an apocalyptic number.

It is an amenable number.

15616064644 is a deficient number, since it is larger than the sum of its proper divisors (11712924540).

15616064644 is a wasteful number, since it uses less digits than its factorization.

15616064644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125154 (or 125152 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 15616064644 in words is "fifteen billion, six hundred sixteen million, sixty-four thousand, six hundred forty-four".