56991668594669 has 2 divisors, whose sum is σ = 56991668594670. Its totient is φ = 56991668594668.

The previous prime is 56991668594659. The next prime is 56991668594683. The reversal of 56991668594669 is 96649586619965.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50030582632900 + 6961085961769 = 7073230^2 + 2638387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56991668594669 is a prime.

It is a super-2 number, since 2×56991668594669² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56991668594629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28495834297334 + 28495834297335.

It is an arithmetic number, because the mean of its divisors is an integer number (28495834297335).

Almost surely, 2^{56991668594669} is an apocalyptic number.

It is an amenable number.

56991668594669 is a deficient number, since it is larger than the sum of its proper divisors (1).

56991668594669 is an equidigital number, since it uses as much as digits as its factorization.

56991668594669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40814668800, while the sum is 89.

The spelling of 56991668594669 in words is "fifty-six trillion, nine hundred ninety-one billion, six hundred sixty-eight million, five hundred ninety-four thousand, six hundred sixty-nine".