78656500715 has 16 divisors (see below), whose sum is σ = 101753166816. Its totient is φ = 58024934400.

The previous prime is 78656500687. The next prime is 78656500831. The reversal of 78656500715 is 51700565687.

It is a happy number.

It is not a de Polignac number, because 78656500715 - 2³⁶ = 9937023979 is a prime.

It is a super-2 number, since 2×78656500715² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560006 + ... + 686235.

It is an arithmetic number, because the mean of its divisors is an integer number (6359572926).

Almost surely, 2^78656500715 is an apocalyptic number.

78656500715 is a deficient number, since it is larger than the sum of its proper divisors (23096666101).

78656500715 is a wasteful number, since it uses less digits than its factorization.

78656500715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247230.

The product of its (nonzero) digits is 1764000, while the sum is 50.

The spelling of 78656500715 in words is "seventy-eight billion, six hundred fifty-six million, five hundred thousand, seven hundred fifteen".