56661065 has 4 divisors (see below), whose sum is σ = 67993284. Its totient is φ = 45328848.

The previous prime is 56661061. The next prime is 56661079. The reversal of 56661065 is 56016665.

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 18567481 + 38093584 = 4309^2 + 6172^2 .

It is a cyclic number.

It is not a de Polignac number, because 56661065 - 2² = 56661061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56661061) 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, 5666102 + ... + 5666111.

It is an arithmetic number, because the mean of its divisors is an integer number (16998321).

Almost surely, 2^56661065 is an apocalyptic number.

It is an amenable number.

56661065 is a deficient number, since it is larger than the sum of its proper divisors (11332219).

56661065 is a wasteful number, since it uses less digits than its factorization.

56661065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11332218.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 56661065 is about 7527.3544489415. The cubic root of 56661065 is about 384.0857939994.

The spelling of 56661065 in words is "fifty-six million, six hundred sixty-one thousand, sixty-five".