77317061897 has 2 divisors, whose sum is σ = 77317061898. Its totient is φ = 77317061896.

The previous prime is 77317061891. The next prime is 77317061911. The reversal of 77317061897 is 79816071377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72803372041 + 4513689856 = 269821^2 + 67184^2 .

It is a cyclic number.

It is not a de Polignac number, because 77317061897 - 2⁴ = 77317061881 is a prime.

It is not a weakly prime, because it can be changed into another prime (77317061891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38658530948 + 38658530949.

It is an arithmetic number, because the mean of its divisors is an integer number (38658530949).

Almost surely, 2^77317061897 is an apocalyptic number.

It is an amenable number.

77317061897 is a deficient number, since it is larger than the sum of its proper divisors (1).

77317061897 is an equidigital number, since it uses as much as digits as its factorization.

77317061897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3111696, while the sum is 56.

The spelling of 77317061897 in words is "seventy-seven billion, three hundred seventeen million, sixty-one thousand, eight hundred ninety-seven".