56866517 has 2 divisors, whose sum is σ = 56866518. Its totient is φ = 56866516.

The previous prime is 56866507. The next prime is 56866519. The reversal of 56866517 is 71566865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43573201 + 13293316 = 6601^2 + 3646^2 .

It is a cyclic number.

It is not a de Polignac number, because 56866517 - 2¹⁴ = 56850133 is a prime.

It is a super-2 number, since 2×56866517² = 6467601511422578, which contains 22 as substring.

Together with 56866519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56866519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28433258 + 28433259.

It is an arithmetic number, because the mean of its divisors is an integer number (28433259).

Almost surely, 2^56866517 is an apocalyptic number.

It is an amenable number.

56866517 is a deficient number, since it is larger than the sum of its proper divisors (1).

56866517 is an equidigital number, since it uses as much as digits as its factorization.

56866517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 44.

The square root of 56866517 is about 7540.9891261028. The cubic root of 56866517 is about 384.5494634190.

The spelling of 56866517 in words is "fifty-six million, eight hundred sixty-six thousand, five hundred seventeen".