56661613 has 2 divisors, whose sum is σ = 56661614. Its totient is φ = 56661612.

The previous prime is 56661607. The next prime is 56661617. The reversal of 56661613 is 31616665.

56661613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51652969 + 5008644 = 7187^2 + 2238^2 .

It is a cyclic number.

It is not a de Polignac number, because 56661613 - 2²⁵ = 23107181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56661617) 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 as a sum of consecutive naturals, namely, 28330806 + 28330807.

It is an arithmetic number, because the mean of its divisors is an integer number (28330807).

Almost surely, 2^56661613 is an apocalyptic number.

It is an amenable number.

56661613 is a deficient number, since it is larger than the sum of its proper divisors (1).

56661613 is an equidigital number, since it uses as much as digits as its factorization.

56661613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 56661613 is about 7527.3908494245. The cubic root of 56661613 is about 384.0870322297.

The spelling of 56661613 in words is "fifty-six million, six hundred sixty-one thousand, six hundred thirteen".