15990708125 has 20 divisors (see below), whose sum is σ = 22836564960. Its totient is φ = 10965054000.

The previous prime is 15990708103. The next prime is 15990708169. The reversal of 15990708125 is 52180709951.

It is a happy number.

It is not a de Polignac number, because 15990708125 - 2⁶ = 15990708061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15990708125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1823135 + ... + 1831884.

It is an arithmetic number, because the mean of its divisors is an integer number (1141828248).

Almost surely, 2^15990708125 is an apocalyptic number.

It is an amenable number.

15990708125 is a deficient number, since it is larger than the sum of its proper divisors (6845856835).

15990708125 is an frugal number, since it uses more digits than its factorization.

15990708125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655046 (or 3655031 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 47.

The spelling of 15990708125 in words is "fifteen billion, nine hundred ninety million, seven hundred eight thousand, one hundred twenty-five".