78117803586 has 12 divisors (see below), whose sum is σ = 169255241142. Its totient is φ = 26039267856.

The previous prime is 78117803579. The next prime is 78117803609. The reversal of 78117803586 is 68530871187.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 70367642361 + 7750161225 = 265269^2 + 88035^2 .

It is a super-2 number, since 2×78117803586² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2169938971 + ... + 2169939006.

Almost surely, 2^78117803586 is an apocalyptic number.

78117803586 is an abundant number, since it is smaller than the sum of its proper divisors (91137437556).

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

78117803586 is a wasteful number, since it uses less digits than its factorization.

78117803586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4339877985 (or 4339877982 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 54.

The spelling of 78117803586 in words is "seventy-eight billion, one hundred seventeen million, eight hundred three thousand, five hundred eighty-six".