309668856293 has 2 divisors, whose sum is σ = 309668856294. Its totient is φ = 309668856292.

The previous prime is 309668856281. The next prime is 309668856307. The reversal of 309668856293 is 392658866903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174291220324 + 135377635969 = 417482^2 + 367937^2 .

It is a cyclic number.

It is not a de Polignac number, because 309668856293 - 2²² = 309664661989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309668856593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154834428146 + 154834428147.

It is an arithmetic number, because the mean of its divisors is an integer number (154834428147).

Almost surely, 2^309668856293 is an apocalyptic number.

It is an amenable number.

309668856293 is a deficient number, since it is larger than the sum of its proper divisors (1).

309668856293 is an equidigital number, since it uses as much as digits as its factorization.

309668856293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100776960, while the sum is 65.

The spelling of 309668856293 in words is "three hundred nine billion, six hundred sixty-eight million, eight hundred fifty-six thousand, two hundred ninety-three".