56661611 has 4 divisors (see below), whose sum is σ = 57730752. Its totient is φ = 55592472.

The previous prime is 56661607. The next prime is 56661613. The reversal of 56661611 is 11616665.

56661611 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.

It is a cyclic number.

It is not a de Polignac number, because 56661611 - 2² = 56661607 is a prime.

It is a super-2 number, since 2×56661611² = 6421076322230642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56661613) 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, 534491 + ... + 534596.

It is an arithmetic number, because the mean of its divisors is an integer number (14432688).

Almost surely, 2^56661611 is an apocalyptic number.

56661611 is a deficient number, since it is larger than the sum of its proper divisors (1069141).

56661611 is a wasteful number, since it uses less digits than its factorization.

56661611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069140.

The product of its digits is 6480, while the sum is 32.

The square root of 56661611 is about 7527.3907165764. The cubic root of 56661611 is about 384.0870277106.

The spelling of 56661611 in words is "fifty-six million, six hundred sixty-one thousand, six hundred eleven".