56667561 has 16 divisors (see below), whose sum is σ = 79108224. Its totient is φ = 36013824.

The previous prime is 56667551. The next prime is 56667577. The reversal of 56667561 is 16576665.

56667561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56667561 - 2⁷ = 56667433 is a prime.

It is a super-2 number, since 2×56667561² = 6422424939377442, which contains 22 as substring.

Its product of digits (226800) is a multiple of the sum of its prime divisors (2800).

It is not an unprimeable number, because it can be changed into a prime (56667551) 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 15 ways as a sum of consecutive naturals, for example, 22035 + ... + 24471.

It is an arithmetic number, because the mean of its divisors is an integer number (4944264).

Almost surely, 2^56667561 is an apocalyptic number.

It is an amenable number.

56667561 is a deficient number, since it is larger than the sum of its proper divisors (22440663).

56667561 is a wasteful number, since it uses less digits than its factorization.

56667561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800.

The product of its digits is 226800, while the sum is 42.

The square root of 56667561 is about 7527.7859294749. The cubic root of 56667561 is about 384.1004714855.

The spelling of 56667561 in words is "fifty-six million, six hundred sixty-seven thousand, five hundred sixty-one".