15638620816 has 80 divisors (see below), whose sum is σ = 38201804928. Its totient is φ = 6035788800.

The previous prime is 15638620787. The next prime is 15638620819. The reversal of 15638620816 is 61802683651.

It is a super-2 number, since 2×15638620816² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15638620819) 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 15 ways as a sum of consecutive naturals, for example, 71290 + ... + 190681.

Almost surely, 2^15638620816 is an apocalyptic number.

15638620816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15638620816 is an abundant number, since it is smaller than the sum of its proper divisors (22563184112).

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

15638620816 is a wasteful number, since it uses less digits than its factorization.

15638620816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262040 (or 262034 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 15638620816 in words is "fifteen billion, six hundred thirty-eight million, six hundred twenty thousand, eight hundred sixteen".