56666563 has 2 divisors, whose sum is σ = 56666564. Its totient is φ = 56666562.

The previous prime is 56666557. The next prime is 56666579. The reversal of 56666563 is 36566665.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56666563 is a prime.

It is a super-2 number, since 2×56666563² = 6422198724465938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56666263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333281 + 28333282.

It is an arithmetic number, because the mean of its divisors is an integer number (28333282).

Almost surely, 2^56666563 is an apocalyptic number.

56666563 is a deficient number, since it is larger than the sum of its proper divisors (1).

56666563 is an equidigital number, since it uses as much as digits as its factorization.

56666563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 43.

The square root of 56666563 is about 7527.7196414319. The cubic root of 56666563 is about 384.0982166121.

The spelling of 56666563 in words is "fifty-six million, six hundred sixty-six thousand, five hundred sixty-three".