15551665008 has 160 divisors (see below), whose sum is σ = 47167909632. Its totient is φ = 4362547200.

The previous prime is 15551664979. The next prime is 15551665013. The reversal of 15551665008 is 80056615551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 533335 + ... + 561737.

Almost surely, 2^15551665008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15551665008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23583954816).

15551665008 is an abundant number, since it is smaller than the sum of its proper divisors (31616244624).

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

15551665008 is a wasteful number, since it uses less digits than its factorization.

15551665008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28503 (or 28497 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 42.

The spelling of 15551665008 in words is "fifteen billion, five hundred fifty-one million, six hundred sixty-five thousand, eight".