78934495169 has 2 divisors, whose sum is σ = 78934495170. Its totient is φ = 78934495168.

The previous prime is 78934495127. The next prime is 78934495219. The reversal of 78934495169 is 96159443987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56590224769 + 22344270400 = 237887^2 + 149480^2 .

It is a cyclic number.

It is not a de Polignac number, because 78934495169 - 2²⁸ = 78666059713 is a prime.

It is a super-2 number, since 2×78934495169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78934495469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39467247584 + 39467247585.

It is an arithmetic number, because the mean of its divisors is an integer number (39467247585).

Almost surely, 2^78934495169 is an apocalyptic number.

It is an amenable number.

78934495169 is a deficient number, since it is larger than the sum of its proper divisors (1).

78934495169 is an equidigital number, since it uses as much as digits as its factorization.

78934495169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58786560, while the sum is 65.

The spelling of 78934495169 in words is "seventy-eight billion, nine hundred thirty-four million, four hundred ninety-five thousand, one hundred sixty-nine".