78015525864 has 64 divisors (see below), whose sum is σ = 201233592000. Its totient is φ = 25188334080.

The previous prime is 78015525859. The next prime is 78015525869. The reversal of 78015525864 is 46852551087.

It is an interprime number because it is at equal distance from previous prime (78015525859) and next prime (78015525869).

It is not an unprimeable number, because it can be changed into a prime (78015525869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148419 + ... + 421970.

It is an arithmetic number, because the mean of its divisors is an integer number (3144274875).

Almost surely, 2^78015525864 is an apocalyptic number.

It is an amenable number.

78015525864 is an abundant number, since it is smaller than the sum of its proper divisors (123218066136).

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

78015525864 is a wasteful number, since it uses less digits than its factorization.

78015525864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570578 (or 570574 counting only the distinct ones).

The product of its (nonzero) digits is 2688000, while the sum is 51.

The spelling of 78015525864 in words is "seventy-eight billion, fifteen million, five hundred twenty-five thousand, eight hundred sixty-four".