56551666 has 4 divisors (see below), whose sum is σ = 84827502. Its totient is φ = 28275832.

The previous prime is 56551613. The next prime is 56551699. The reversal of 56551666 is 66615565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55935441 + 616225 = 7479^2 + 785^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14137915 + ... + 14137918.

Almost surely, 2^56551666 is an apocalyptic number.

56551666 is a deficient number, since it is larger than the sum of its proper divisors (28275836).

56551666 is a wasteful number, since it uses less digits than its factorization.

56551666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28275835.

The product of its digits is 162000, while the sum is 40.

The square root of 56551666 is about 7520.0841750608. The cubic root of 56551666 is about 383.8384420571.

The spelling of 56551666 in words is "fifty-six million, five hundred fifty-one thousand, six hundred sixty-six".