78501720685005 has 24 divisors (see below), whose sum is σ = 136082152990368. Its totient is φ = 41863737041376.

The previous prime is 78501720684983. The next prime is 78501720685099. The reversal of 78501720685005 is 50058602710587.

78501720685005 is a `hidden beast` number, since 7 + 8 + 5 + 0 + 1 + 72 + 0 + 68 + 500 + 5 = 666.

It is not a de Polignac number, because 78501720685005 - 2³² = 78497425717709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79657407 + ... + 80636876.

It is an arithmetic number, because the mean of its divisors is an integer number (5670089707932).

Almost surely, 2^{78501720685005} is an apocalyptic number.

It is an amenable number.

78501720685005 is a deficient number, since it is larger than the sum of its proper divisors (57580432305363).

78501720685005 is a wasteful number, since it uses less digits than its factorization.

78501720685005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160305177 (or 160305174 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 54.

The spelling of 78501720685005 in words is "seventy-eight trillion, five hundred one billion, seven hundred twenty million, six hundred eighty-five thousand, five".