77986137112493 has 2 divisors, whose sum is σ = 77986137112494. Its totient is φ = 77986137112492.

The previous prime is 77986137112483. The next prime is 77986137112523. The reversal of 77986137112493 is 39421173168977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42608230140004 + 35377906972489 = 6527498^2 + 5947933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77986137112493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77986137112453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38993068556246 + 38993068556247.

It is an arithmetic number, because the mean of its divisors is an integer number (38993068556247).

Almost surely, 2^{77986137112493} is an apocalyptic number.

It is an amenable number.

77986137112493 is a deficient number, since it is larger than the sum of its proper divisors (1).

77986137112493 is an equidigital number, since it uses as much as digits as its factorization.

77986137112493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96018048, while the sum is 68.

The spelling of 77986137112493 in words is "seventy-seven trillion, nine hundred eighty-six billion, one hundred thirty-seven million, one hundred twelve thousand, four hundred ninety-three".