309668856407 has 2 divisors, whose sum is σ = 309668856408. Its totient is φ = 309668856406.

The previous prime is 309668856331. The next prime is 309668856421. The reversal of 309668856407 is 704658866903.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309668856407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 309668856407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309668856437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154834428203 + 154834428204.

It is an arithmetic number, because the mean of its divisors is an integer number (154834428204).

Almost surely, 2^309668856407 is an apocalyptic number.

309668856407 is a deficient number, since it is larger than the sum of its proper divisors (1).

309668856407 is an equidigital number, since it uses as much as digits as its factorization.

309668856407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 62.

The spelling of 309668856407 in words is "three hundred nine billion, six hundred sixty-eight million, eight hundred fifty-six thousand, four hundred seven".