56716661 has 4 divisors (see below), whose sum is σ = 56731872. Its totient is φ = 56701452.

The previous prime is 56716619. The next prime is 56716669. The reversal of 56716661 is 16661765.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 56716661 - 2¹⁴ = 56700277 is a prime.

It is a super-3 number, since 3×56716661³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56716669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2216 + ... + 10878.

It is an arithmetic number, because the mean of its divisors is an integer number (14182968).

Almost surely, 2^56716661 is an apocalyptic number.

It is an amenable number.

56716661 is a deficient number, since it is larger than the sum of its proper divisors (15211).

56716661 is an equidigital number, since it uses as much as digits as its factorization.

56716661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15210.

The product of its digits is 45360, while the sum is 38.

The square root of 56716661 is about 7531.0464744284. The cubic root of 56716661 is about 384.2113749636.

The spelling of 56716661 in words is "fifty-six million, seven hundred sixteen thousand, six hundred sixty-one".