5621666666 has 128 divisors (see below), whose sum is σ = 11167580160. Its totient is φ = 2059200000.

The previous prime is 5621666657. The next prime is 5621666671. The reversal of 5621666666 is 6666661265.

It is a super-2 number, since 2×5621666666² = 63206272207231111112, which contains 22 as substring.

5621666666 is a modest number, since divided by 66666 gives 56216 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42913421 + ... + 42913551.

It is an arithmetic number, because the mean of its divisors is an integer number (87246720).

Almost surely, 2^5621666666 is an apocalyptic number.

5621666666 is a deficient number, since it is larger than the sum of its proper divisors (5545913494).

5621666666 is a wasteful number, since it uses less digits than its factorization.

5621666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372.

The product of its digits is 2799360, while the sum is 50.

The square root of 5621666666 is about 74977.7744801751. The cubic root of 5621666666 is about 1778.0952846555.

The spelling of 5621666666 in words is "five billion, six hundred twenty-one million, six hundred sixty-six thousand, six hundred sixty-six".