15999800000625 has 405 divisors, whose sum is σ = 35544084879303. Its totient is φ = 6911956800000.

The previous prime is 15999800000617. The next prime is 15999800000641. The reversal of 15999800000625 is 52600000899951.

The square root of 15999800000625 is 3999975.

It is a perfect power (a square), and thus also a powerful number.

15999800000625 is a `hidden beast` number, since 1 + 5 + 9 + 9 + 9 + 8 + 0 + 0 + 0 + 0 + 0 + 625 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 2242347517809 + 13757452482816 = 1497447^2 + 3709104^2 .

It is not a de Polignac number, because 15999800000625 - 2³ = 15999800000617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 404 ways as a sum of consecutive naturals, for example, 39899750425 + ... + 39899750825.

Almost surely, 2^{15999800000625} is an apocalyptic number.

15999800000625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15999800000625 is the 3999975-th square number.

15999800000625 is the 1999988-th centered octagonal number.

It is an amenable number.

15999800000625 is an abundant number, since it is smaller than the sum of its proper divisors (19544284878678).

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

15999800000625 is an frugal number, since it uses more digits than its factorization.

15999800000625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 54.

The spelling of 15999800000625 in words is "fifteen trillion, nine hundred ninety-nine billion, eight hundred million, six hundred twenty-five", and thus it is an aban number.