15621104064 has 28 divisors (see below), whose sum is σ = 41330838344. Its totient is φ = 5207034624.

The previous prime is 15621104033. The next prime is 15621104101. The reversal of 15621104064 is 46040112651.

It is a congruent number.

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, 40679767 + ... + 40680150.

Almost surely, 2^15621104064 is an apocalyptic number.

It is an amenable number.

15621104064 is an abundant number, since it is smaller than the sum of its proper divisors (25709734280).

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

15621104064 is an equidigital number, since it uses as much as digits as its factorization.

15621104064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81359932 (or 81359922 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 15621104064 in words is "fifteen billion, six hundred twenty-one million, one hundred four thousand, sixty-four".