7938791906957 has 2 divisors, whose sum is σ = 7938791906958. Its totient is φ = 7938791906956.

The previous prime is 7938791906923. The next prime is 7938791906989. The reversal of 7938791906957 is 7596091978397.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7797911040676 + 140880866281 = 2792474^2 + 375341^2 .

It is a cyclic number.

It is not a de Polignac number, because 7938791906957 - 2¹² = 7938791902861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7938791906657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969395953478 + 3969395953479.

It is an arithmetic number, because the mean of its divisors is an integer number (3969395953479).

Almost surely, 2^{7938791906957} is an apocalyptic number.

It is an amenable number.

7938791906957 is a deficient number, since it is larger than the sum of its proper divisors (1).

7938791906957 is an equidigital number, since it uses as much as digits as its factorization.

7938791906957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620304560, while the sum is 80.

The spelling of 7938791906957 in words is "seven trillion, nine hundred thirty-eight billion, seven hundred ninety-one million, nine hundred six thousand, nine hundred fifty-seven".