77703947957 has 2 divisors, whose sum is σ = 77703947958. Its totient is φ = 77703947956.

The previous prime is 77703947933. The next prime is 77703947969. The reversal of 77703947957 is 75974930777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77689855441 + 14092516 = 278729^2 + 3754^2 .

It is a cyclic number.

It is not a de Polignac number, because 77703947957 - 2²⁸ = 77435512501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77703947893 and 77703947902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77703947917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38851973978 + 38851973979.

It is an arithmetic number, because the mean of its divisors is an integer number (38851973979).

Almost surely, 2^77703947957 is an apocalyptic number.

It is an amenable number.

77703947957 is a deficient number, since it is larger than the sum of its proper divisors (1).

77703947957 is an equidigital number, since it uses as much as digits as its factorization.

77703947957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81682020, while the sum is 65.

The spelling of 77703947957 in words is "seventy-seven billion, seven hundred three million, nine hundred forty-seven thousand, nine hundred fifty-seven".