56644565991617 has 2 divisors, whose sum is σ = 56644565991618. Its totient is φ = 56644565991616.

The previous prime is 56644565991539. The next prime is 56644565991631. The reversal of 56644565991617 is 71619956544665.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47762252728576 + 8882313263041 = 6911024^2 + 2980321^2 .

It is a cyclic number.

It is not a de Polignac number, because 56644565991617 - 2³⁰ = 56643492249793 is a prime.

It is not a weakly prime, because it can be changed into another prime (56644565991677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28322282995808 + 28322282995809.

It is an arithmetic number, because the mean of its divisors is an integer number (28322282995809).

Almost surely, 2^{56644565991617} is an apocalyptic number.

It is an amenable number.

56644565991617 is a deficient number, since it is larger than the sum of its proper divisors (1).

56644565991617 is an equidigital number, since it uses as much as digits as its factorization.

56644565991617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664000, while the sum is 74.

The spelling of 56644565991617 in words is "fifty-six trillion, six hundred forty-four billion, five hundred sixty-five million, nine hundred ninety-one thousand, six hundred seventeen".