15681600000 has 900 divisors, whose sum is σ = 64305020934. Its totient is φ = 3801600000.

The previous prime is 15681599957. The next prime is 15681600023. The reversal of 15681600000 is 618651.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

15681600000 is a `hidden beast` number, since 1 + 56 + 8 + 1 + 600 + 0 + 0 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 22581504 + 15659018496 = 4752^2 + 125136^2 .

It is a tau number, because it is divible by the number of its divisors (900).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 1425599995 + ... + 1425600005.

Almost surely, 2^15681600000 is an apocalyptic number.

15681600000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15681600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32152510467).

15681600000 is an abundant number, since it is smaller than the sum of its proper divisors (48623420934).

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

15681600000 is an frugal number, since it uses more digits than its factorization.

15681600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Multiplying 15681600000 by its product of nonzero digits (1440), we get a square (22581504000000 = 4752000²).

15681600000 divided by its product of nonzero digits (1440) gives a square (10890000 = 3300²).

The spelling of 15681600000 in words is "fifteen billion, six hundred eighty-one million, six hundred thousand".