309668856394 has 16 divisors (see below), whose sum is σ = 491926773888. Its totient is φ = 145696960192.

The previous prime is 309668856331. The next prime is 309668856407. The reversal of 309668856394 is 493658866903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753232 + ... + 1089355.

It is an arithmetic number, because the mean of its divisors is an integer number (30745423368).

Almost surely, 2^309668856394 is an apocalyptic number.

309668856394 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

309668856394 is a deficient number, since it is larger than the sum of its proper divisors (182257917494).

309668856394 is a wasteful number, since it uses less digits than its factorization.

309668856394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847549.

The product of its (nonzero) digits is 201553920, while the sum is 67.

The spelling of 309668856394 in words is "three hundred nine billion, six hundred sixty-eight million, eight hundred fifty-six thousand, three hundred ninety-four".