309668856393 has 24 divisors (see below), whose sum is σ = 447583039680. Its totient is φ = 190357801920.

The previous prime is 309668856331. The next prime is 309668856407. The reversal of 309668856393 is 393658866903.

It is not a de Polignac number, because 309668856393 - 2¹⁰ = 309668855369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (309668856293) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133623 + ... + 798243.

It is an arithmetic number, because the mean of its divisors is an integer number (18649293320).

Almost surely, 2^309668856393 is an apocalyptic number.

It is an amenable number.

309668856393 is a deficient number, since it is larger than the sum of its proper divisors (137914183287).

309668856393 is a wasteful number, since it uses less digits than its factorization.

309668856393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665569 (or 665556 counting only the distinct ones).

The product of its (nonzero) digits is 151165440, while the sum is 66.

The spelling of 309668856393 in words is "three hundred nine billion, six hundred sixty-eight million, eight hundred fifty-six thousand, three hundred ninety-three".