56510661 has 4 divisors (see below), whose sum is σ = 75347552. Its totient is φ = 37673772.

The previous prime is 56510651. The next prime is 56510677. The reversal of 56510661 is 16601565.

56510661 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 not a de Polignac number, because 56510661 - 2²¹ = 54413509 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 (56510621) 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, 9418441 + ... + 9418446.

It is an arithmetic number, because the mean of its divisors is an integer number (18836888).

Almost surely, 2^56510661 is an apocalyptic number.

It is an amenable number.

56510661 is a deficient number, since it is larger than the sum of its proper divisors (18836891).

56510661 is a wasteful number, since it uses less digits than its factorization.

56510661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18836890.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 56510661 is about 7517.3573149079. The cubic root of 56510661 is about 383.7456472608.

The spelling of 56510661 in words is "fifty-six million, five hundred ten thousand, six hundred sixty-one".