15506156664 has 48 divisors (see below), whose sum is σ = 42388346520. Its totient is φ = 5120410560.

The previous prime is 15506156647. The next prime is 15506156681. The reversal of 15506156664 is 46665160551.

It is an interprime number because it is at equal distance from previous prime (15506156647) and next prime (15506156681).

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, 998667 + ... + 1014074.

Almost surely, 2^15506156664 is an apocalyptic number.

It is an amenable number.

15506156664 is an abundant number, since it is smaller than the sum of its proper divisors (26882189856).

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

15506156664 is a wasteful number, since it uses less digits than its factorization.

15506156664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012860 (or 2012853 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 15506156664 in words is "fifteen billion, five hundred six million, one hundred fifty-six thousand, six hundred sixty-four".