56426661 has 6 divisors (see below), whose sum is σ = 81505190. Its totient is φ = 37617768.

The previous prime is 56426653. The next prime is 56426677. The reversal of 56426661 is 16662465.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 36978561 + 19448100 = 6081^2 + 4410^2 .

It is not a de Polignac number, because 56426661 - 2³ = 56426653 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 (56426641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3134806 + ... + 3134823.

Almost surely, 2^56426661 is an apocalyptic number.

It is an amenable number.

56426661 is a deficient number, since it is larger than the sum of its proper divisors (25078529).

56426661 is a wasteful number, since it uses less digits than its factorization.

56426661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6269635 (or 6269632 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 56426661 is about 7511.7681673491. The cubic root of 56426661 is about 383.5554140158. Note that the first 3 decimals are identical.

It can be divided in two parts, 564 and 26661, that added together give a square (27225 = 165²).

The spelling of 56426661 in words is "fifty-six million, four hundred twenty-six thousand, six hundred sixty-one".