15985615120 has 40 divisors (see below), whose sum is σ = 37361180160. Its totient is φ = 6360762240.

The previous prime is 15985615057. The next prime is 15985615123. The reversal of 15985615120 is 2151658951.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×15985615120² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15985615123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507810 + ... + 538369.

It is an arithmetic number, because the mean of its divisors is an integer number (934029504).

Almost surely, 2^15985615120 is an apocalyptic number.

15985615120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15985615120 is an abundant number, since it is smaller than the sum of its proper divisors (21375565040).

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

15985615120 is a wasteful number, since it uses less digits than its factorization.

15985615120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046383 (or 1046377 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 43.

The spelling of 15985615120 in words is "fifteen billion, nine hundred eighty-five million, six hundred fifteen thousand, one hundred twenty".