56719661 has 4 divisors (see below), whose sum is σ = 56784924. Its totient is φ = 56654400.

The previous prime is 56719651. The next prime is 56719717. The reversal of 56719661 is 16691765.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25694761 + 31024900 = 5069^2 + 5570^2 .

It is a cyclic number.

It is not a de Polignac number, because 56719661 - 2¹⁰ = 56718637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56719601) 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, 31310 + ... + 33071.

It is an arithmetic number, because the mean of its divisors is an integer number (14196231).

Almost surely, 2^56719661 is an apocalyptic number.

It is an amenable number.

56719661 is a deficient number, since it is larger than the sum of its proper divisors (65263).

56719661 is an equidigital number, since it uses as much as digits as its factorization.

56719661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65262.

The product of its digits is 68040, while the sum is 41.

The square root of 56719661 is about 7531.2456473016. The cubic root of 56719661 is about 384.2181490684.

The spelling of 56719661 in words is "fifty-six million, seven hundred nineteen thousand, six hundred sixty-one".