77509918231 has 2 divisors, whose sum is σ = 77509918232. Its totient is φ = 77509918230.

The previous prime is 77509918177. The next prime is 77509918253. The reversal of 77509918231 is 13281990577.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77509918231 is a prime.

It is a super-2 number, since 2×77509918231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77509918631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38754959115 + 38754959116.

It is an arithmetic number, because the mean of its divisors is an integer number (38754959116).

Almost surely, 2^77509918231 is an apocalyptic number.

77509918231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77509918231 is an equidigital number, since it uses as much as digits as its factorization.

77509918231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 77509918231 in words is "seventy-seven billion, five hundred nine million, nine hundred eighteen thousand, two hundred thirty-one".