78396500015 has 16 divisors (see below), whose sum is σ = 94824591840. Its totient is φ = 62218316160.

The previous prime is 78396499949. The next prime is 78396500029. The reversal of 78396500015 is 51000569387.

It is not a de Polignac number, because 78396500015 - 2¹⁴ = 78396483631 is a prime.

It is a super-2 number, since 2×78396500015² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2202137 + ... + 2237453.

It is an arithmetic number, because the mean of its divisors is an integer number (5926536990).

Almost surely, 2^78396500015 is an apocalyptic number.

78396500015 is a deficient number, since it is larger than the sum of its proper divisors (16428091825).

78396500015 is a wasteful number, since it uses less digits than its factorization.

78396500015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38842.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 78396500015 in words is "seventy-eight billion, three hundred ninety-six million, five hundred thousand, fifteen".