5666618 has 4 divisors (see below), whose sum is σ = 8499930. Its totient is φ = 2833308.

The previous prime is 5666599. The next prime is 5666621. The reversal of 5666618 is 8166665.

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., 5442889 + 223729 = 2333^2 + 473^2 .

It is a super-2 number, since 2×5666618² = 64221119115848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1416653 + ... + 1416656.

Almost surely, 2^5666618 is an apocalyptic number.

5666618 is a deficient number, since it is larger than the sum of its proper divisors (2833312).

5666618 is a wasteful number, since it uses less digits than its factorization.

5666618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833311.

The product of its digits is 51840, while the sum is 38.

The square root of 5666618 is about 2380.4659207811. The cubic root of 5666618 is about 178.2821976619.

The spelling of 5666618 in words is "five million, six hundred sixty-six thousand, six hundred eighteen".