56556666 has 24 divisors (see below), whose sum is σ = 122781204. Its totient is φ = 18815040.

The previous prime is 56556659. The next prime is 56556691. The reversal of 56556666 is 66665565.

It can be written as a sum of positive squares in 2 ways, for example, as 56025225 + 531441 = 7485^2 + 729^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7206 + ... + 12846.

Almost surely, 2^56556666 is an apocalyptic number.

56556666 is an abundant number, since it is smaller than the sum of its proper divisors (66224538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56556666 is a wasteful number, since it uses less digits than its factorization.

56556666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6206 (or 6203 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 56556666 is about 7520.4166108002. The cubic root of 56556666 is about 383.8497540471.

It can be divided in two parts, 5655 and 6666, that added together give a palindrome (12321).

The spelling of 56556666 in words is "fifty-six million, five hundred fifty-six thousand, six hundred sixty-six".