15687532379664 has 30 divisors (see below), whose sum is σ = 43903302424046. Its totient is φ = 5229177459840.

The previous prime is 15687532379657. The next prime is 15687532379677. The reversal of 15687532379664 is 46697323578651.

It is a happy number.

15687532379664 is a `hidden beast` number, since 1 + 5 + 6 + 87 + 532 + 3 + 7 + 9 + 6 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15547312088064 + 140220291600 = 3943008^2 + 374460^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 15687532379592 and 15687532379601.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54470598397 + ... + 54470598684.

Almost surely, 2^{15687532379664} is an apocalyptic number.

It is an amenable number.

15687532379664 is an abundant number, since it is smaller than the sum of its proper divisors (28215770044382).

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

15687532379664 is a wasteful number, since it uses less digits than its factorization.

15687532379664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108941197095 (or 108941197086 counting only the distinct ones).

The product of its digits is 1371686400, while the sum is 72.

The spelling of 15687532379664 in words is "fifteen trillion, six hundred eighty-seven billion, five hundred thirty-two million, three hundred seventy-nine thousand, six hundred sixty-four".