77908818877 has 2 divisors, whose sum is σ = 77908818878. Its totient is φ = 77908818876.

The previous prime is 77908818851. The next prime is 77908818901. The reversal of 77908818877 is 77881880977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76150610116 + 1758208761 = 275954^2 + 41931^2 .

It is a cyclic number.

It is not a de Polignac number, because 77908818877 - 2²³ = 77900430269 is a prime.

It is a super-2 number, since 2×77908818877² (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 (77908818817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38954409438 + 38954409439.

It is an arithmetic number, because the mean of its divisors is an integer number (38954409439).

Almost surely, 2^77908818877 is an apocalyptic number.

It is an amenable number.

77908818877 is a deficient number, since it is larger than the sum of its proper divisors (1).

77908818877 is an equidigital number, since it uses as much as digits as its factorization.

77908818877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88510464, while the sum is 70.

The spelling of 77908818877 in words is "seventy-seven billion, nine hundred eight million, eight hundred eighteen thousand, eight hundred seventy-seven".