56974394509 has 2 divisors, whose sum is σ = 56974394510. Its totient is φ = 56974394508.

The previous prime is 56974394437. The next prime is 56974394527. The reversal of 56974394509 is 90549347965.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49052504484 + 7921890025 = 221478^2 + 89005^2 .

It is a cyclic number.

It is not a de Polignac number, because 56974394509 - 2²¹ = 56972297357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56974394579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28487197254 + 28487197255.

It is an arithmetic number, because the mean of its divisors is an integer number (28487197255).

Almost surely, 2^56974394509 is an apocalyptic number.

It is an amenable number.

56974394509 is a deficient number, since it is larger than the sum of its proper divisors (1).

56974394509 is an equidigital number, since it uses as much as digits as its factorization.

56974394509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36741600, while the sum is 61.

The spelling of 56974394509 in words is "fifty-six billion, nine hundred seventy-four million, three hundred ninety-four thousand, five hundred nine".