15115505640 has 32 divisors (see below), whose sum is σ = 45346517280. Its totient is φ = 4030801472.

The previous prime is 15115505627. The next prime is 15115505687. The reversal of 15115505640 is 4650551151.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62981154 + ... + 62981393.

It is an arithmetic number, because the mean of its divisors is an integer number (1417078665).

Almost surely, 2^15115505640 is an apocalyptic number.

15115505640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15115505640 is an abundant number, since it is smaller than the sum of its proper divisors (30231011640).

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

15115505640 is a wasteful number, since it uses less digits than its factorization.

15115505640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125962561 (or 125962557 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 33.

The spelling of 15115505640 in words is "fifteen billion, one hundred fifteen million, five hundred five thousand, six hundred forty".