77908809313 has 2 divisors, whose sum is σ = 77908809314. Its totient is φ = 77908809312.

The previous prime is 77908809281. The next prime is 77908809317. The reversal of 77908809313 is 31390880977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76536329104 + 1372480209 = 276652^2 + 37047^2 .

It is a cyclic number.

It is not a de Polignac number, because 77908809313 - 2⁵ = 77908809281 is a prime.

It is not a weakly prime, because it can be changed into another prime (77908809317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38954404656 + 38954404657.

It is an arithmetic number, because the mean of its divisors is an integer number (38954404657).

Almost surely, 2^77908809313 is an apocalyptic number.

It is an amenable number.

77908809313 is a deficient number, since it is larger than the sum of its proper divisors (1).

77908809313 is an equidigital number, since it uses as much as digits as its factorization.

77908809313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 77908809313 in words is "seventy-seven billion, nine hundred eight million, eight hundred nine thousand, three hundred thirteen".