309940162561 has 16 divisors (see below), whose sum is σ = 315493807104. Its totient is φ = 304443385344.

The previous prime is 309940162559. The next prime is 309940162579. The reversal of 309940162561 is 165261049903.

It is a cyclic number.

It is not a de Polignac number, because 309940162561 - 2¹ = 309940162559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309940162501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9380476 + ... + 9413458.

It is an arithmetic number, because the mean of its divisors is an integer number (19718362944).

Almost surely, 2^309940162561 is an apocalyptic number.

It is an amenable number.

309940162561 is a deficient number, since it is larger than the sum of its proper divisors (5553644543).

309940162561 is a wasteful number, since it uses less digits than its factorization.

309940162561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33840.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 309940162561 in words is "three hundred nine billion, nine hundred forty million, one hundred sixty-two thousand, five hundred sixty-one".