77930818467797 has 2 divisors, whose sum is σ = 77930818467798. Its totient is φ = 77930818467796.

The previous prime is 77930818467703. The next prime is 77930818467823. The reversal of 77930818467797 is 79776481803977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54378102970801 + 23552715496996 = 7374151^2 + 4853114^2 .

It is a cyclic number.

It is not a de Polignac number, because 77930818467797 - 2³⁸ = 77655940560853 is a prime.

It is a super-4 number, since 4×77930818467797⁴ (a number of 57 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77930818466797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38965409233898 + 38965409233899.

It is an arithmetic number, because the mean of its divisors is an integer number (38965409233899).

Almost surely, 2^{77930818467797} is an apocalyptic number.

It is an amenable number.

77930818467797 is a deficient number, since it is larger than the sum of its proper divisors (1).

77930818467797 is an equidigital number, since it uses as much as digits as its factorization.

77930818467797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6273179136, while the sum is 83.

The spelling of 77930818467797 in words is "seventy-seven trillion, nine hundred thirty billion, eight hundred eighteen million, four hundred sixty-seven thousand, seven hundred ninety-seven".