15942617864 has 8 divisors (see below), whose sum is σ = 29892408510. Its totient is φ = 7971308928.

The previous prime is 15942617861. The next prime is 15942617881. The reversal of 15942617864 is 46871624951.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9931716964 + 6010900900 = 99658^2 + 77530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (15942617861) 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 as a sum of consecutive naturals, namely, 996413609 + ... + 996413624.

Almost surely, 2^15942617864 is an apocalyptic number.

It is an amenable number.

15942617864 is a deficient number, since it is larger than the sum of its proper divisors (13949790646).

15942617864 is a wasteful number, since it uses less digits than its factorization.

15942617864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992827239 (or 1992827235 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The spelling of 15942617864 in words is "fifteen billion, nine hundred forty-two million, six hundred seventeen thousand, eight hundred sixty-four".