15121520660 has 24 divisors (see below), whose sum is σ = 33135854976. Its totient is φ = 5785625120.

The previous prime is 15121520647. The next prime is 15121520717. The reversal of 15121520660 is 6602512151.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16435976 + ... + 16436895.

It is an arithmetic number, because the mean of its divisors is an integer number (1380660624).

Almost surely, 2^15121520660 is an apocalyptic number.

15121520660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15121520660 is an abundant number, since it is smaller than the sum of its proper divisors (18014334316).

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

15121520660 is a wasteful number, since it uses less digits than its factorization.

15121520660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32872903 (or 32872901 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 15121520660 in words is "fifteen billion, one hundred twenty-one million, five hundred twenty thousand, six hundred sixty".