309944945816 has 16 divisors (see below), whose sum is σ = 633978298440. Its totient is φ = 140884066240.

The previous prime is 309944945813. The next prime is 309944945819. The reversal of 309944945816 is 618549449903.

It is an interprime number because it is at equal distance from previous prime (309944945813) and next prime (309944945819).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309944945813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1761050741 + ... + 1761050916.

Almost surely, 2^309944945816 is an apocalyptic number.

It is an amenable number.

309944945816 is an abundant number, since it is smaller than the sum of its proper divisors (324033352624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309944945816 is a wasteful number, since it uses less digits than its factorization.

309944945816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3522101674 (or 3522101670 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 62.

The spelling of 309944945816 in words is "three hundred nine billion, nine hundred forty-four million, nine hundred forty-five thousand, eight hundred sixteen".