309597678870545 has 16 divisors (see below), whose sum is σ = 400095841267920. Its totient is φ = 228625761475584.

The previous prime is 309597678870503. The next prime is 309597678870563. The reversal of 309597678870545 is 545078876795903.

It is a Cunningham number, because it is equal to 17595388²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 79799275105936 + 229798403764609 = 8933044^2 + 15159103^2 .

It is a cyclic number.

It is not a de Polignac number, because 309597678870545 - 2¹⁸ = 309597678608401 is a prime.

It is a Smith number, since the sum of its digits (83) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107701901 + ... + 110539109.

It is an arithmetic number, because the mean of its divisors is an integer number (25005990079245).

Almost surely, 2^{309597678870545} is an apocalyptic number.

It is an amenable number.

309597678870545 is a deficient number, since it is larger than the sum of its proper divisors (90498162397375).

309597678870545 is a wasteful number, since it uses less digits than its factorization.

309597678870545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4516004.

The product of its (nonzero) digits is 16003008000, while the sum is 83.

The spelling of 309597678870545 in words is "three hundred nine trillion, five hundred ninety-seven billion, six hundred seventy-eight million, eight hundred seventy thousand, five hundred forty-five".