56666553 has 4 divisors (see below), whose sum is σ = 75555408. Its totient is φ = 37777700.

The previous prime is 56666509. The next prime is 56666557. The reversal of 56666553 is 35566665.

56666553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56666553 - 2⁸ = 56666297 is a prime.

It is a super-2 number, since 2×56666553² = 6422196457803618, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56666557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9444423 + ... + 9444428.

It is an arithmetic number, because the mean of its divisors is an integer number (18888852).

Almost surely, 2^56666553 is an apocalyptic number.

It is an amenable number.

56666553 is a deficient number, since it is larger than the sum of its proper divisors (18888855).

56666553 is a wasteful number, since it uses less digits than its factorization.

56666553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18888854.

The product of its digits is 486000, while the sum is 42.

The square root of 56666553 is about 7527.7189772201. The cubic root of 56666553 is about 384.0981940181.

The spelling of 56666553 in words is "fifty-six million, six hundred sixty-six thousand, five hundred fifty-three".