5666611655 has 4 divisors (see below), whose sum is σ = 6799933992. Its totient is φ = 4533289320.

The previous prime is 5666611651. The next prime is 5666611663. The reversal of 5666611655 is 5561166665.

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

It is not a de Polignac number, because 5666611655 - 2² = 5666611651 is a prime.

It is a super-2 number, since 2×5666611655² = 64220975297163678050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5666611651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566661161 + ... + 566661170.

It is an arithmetic number, because the mean of its divisors is an integer number (1699983498).

Almost surely, 2^5666611655 is an apocalyptic number.

5666611655 is a deficient number, since it is larger than the sum of its proper divisors (1133322337).

5666611655 is a wasteful number, since it uses less digits than its factorization.

5666611655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133322336.

The product of its digits is 972000, while the sum is 47.

The square root of 5666611655 is about 75276.8998763897. The cubic root of 5666611655 is about 1782.8213112010.

The spelling of 5666611655 in words is "five billion, six hundred sixty-six million, six hundred eleven thousand, six hundred fifty-five".