391266068917 has 2 divisors, whose sum is σ = 391266068918. Its totient is φ = 391266068916.

The previous prime is 391266068857. The next prime is 391266068939. The reversal of 391266068917 is 719860662193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337126551876 + 54139517041 = 580626^2 + 232679^2 .

It is a cyclic number.

It is not a de Polignac number, because 391266068917 - 2³⁵ = 356906330549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391266068957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195633034458 + 195633034459.

It is an arithmetic number, because the mean of its divisors is an integer number (195633034459).

Almost surely, 2^391266068917 is an apocalyptic number.

It is an amenable number.

391266068917 is a deficient number, since it is larger than the sum of its proper divisors (1).

391266068917 is an equidigital number, since it uses as much as digits as its factorization.

391266068917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 391266068917 in words is "three hundred ninety-one billion, two hundred sixty-six million, sixty-eight thousand, nine hundred seventeen".