77660777713 has 2 divisors, whose sum is σ = 77660777714. Its totient is φ = 77660777712.

The previous prime is 77660777693. The next prime is 77660777723. The reversal of 77660777713 is 31777706677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59627779344 + 18032998369 = 244188^2 + 134287^2 .

It is an emirp because it is prime and its reverse (31777706677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77660777713 - 2⁵ = 77660777681 is a prime.

It is not a weakly prime, because it can be changed into another prime (77660777723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38830388856 + 38830388857.

It is an arithmetic number, because the mean of its divisors is an integer number (38830388857).

Almost surely, 2^77660777713 is an apocalyptic number.

It is an amenable number.

77660777713 is a deficient number, since it is larger than the sum of its proper divisors (1).

77660777713 is an equidigital number, since it uses as much as digits as its factorization.

77660777713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12706092, while the sum is 58.

The spelling of 77660777713 in words is "seventy-seven billion, six hundred sixty million, seven hundred seventy-seven thousand, seven hundred thirteen".