56170106621 has 2 divisors, whose sum is σ = 56170106622. Its totient is φ = 56170106620.

The previous prime is 56170106609. The next prime is 56170106639. The reversal of 56170106621 is 12660107165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40215890521 + 15954216100 = 200539^2 + 126310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56170106621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56170106021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28085053310 + 28085053311.

It is an arithmetic number, because the mean of its divisors is an integer number (28085053311).

Almost surely, 2^56170106621 is an apocalyptic number.

It is an amenable number.

56170106621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56170106621 is an equidigital number, since it uses as much as digits as its factorization.

56170106621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 56170106621 in words is "fifty-six billion, one hundred seventy million, one hundred six thousand, six hundred twenty-one".