78316978771 has 2 divisors, whose sum is σ = 78316978772. Its totient is φ = 78316978770.

The previous prime is 78316978757. The next prime is 78316978793. The reversal of 78316978771 is 17787961387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78316978771 - 2²³ = 78308590163 is a prime.

It is a super-2 number, since 2×78316978771² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78316978711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39158489385 + 39158489386.

It is an arithmetic number, because the mean of its divisors is an integer number (39158489386).

Almost surely, 2^78316978771 is an apocalyptic number.

78316978771 is a deficient number, since it is larger than the sum of its proper divisors (1).

78316978771 is an equidigital number, since it uses as much as digits as its factorization.

78316978771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24893568, while the sum is 64.

The spelling of 78316978771 in words is "seventy-eight billion, three hundred sixteen million, nine hundred seventy-eight thousand, seven hundred seventy-one".