77207918917 has 2 divisors, whose sum is σ = 77207918918. Its totient is φ = 77207918916.

The previous prime is 77207918849. The next prime is 77207918927. The reversal of 77207918917 is 71981970277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76084395556 + 1123523361 = 275834^2 + 33519^2 .

It is a cyclic number.

It is not a de Polignac number, because 77207918917 - 2²⁷ = 77073701189 is a prime.

It is a super-2 number, since 2×77207918917² (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 (77207918927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38603959458 + 38603959459.

It is an arithmetic number, because the mean of its divisors is an integer number (38603959459).

Almost surely, 2^77207918917 is an apocalyptic number.

It is an amenable number.

77207918917 is a deficient number, since it is larger than the sum of its proper divisors (1).

77207918917 is an equidigital number, since it uses as much as digits as its factorization.

77207918917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3111696, while the sum is 58.

The spelling of 77207918917 in words is "seventy-seven billion, two hundred seven million, nine hundred eighteen thousand, nine hundred seventeen".