77968158731 has 2 divisors, whose sum is σ = 77968158732. Its totient is φ = 77968158730.

The previous prime is 77968158701. The next prime is 77968158739. The reversal of 77968158731 is 13785186977.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77968158731 is a prime.

It is a super-2 number, since 2×77968158731² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (77968158739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38984079365 + 38984079366.

It is an arithmetic number, because the mean of its divisors is an integer number (38984079366).

Almost surely, 2^77968158731 is an apocalyptic number.

77968158731 is a deficient number, since it is larger than the sum of its proper divisors (1).

77968158731 is an equidigital number, since it uses as much as digits as its factorization.

77968158731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17781120, while the sum is 62.

The spelling of 77968158731 in words is "seventy-seven billion, nine hundred sixty-eight million, one hundred fifty-eight thousand, seven hundred thirty-one".