5666616681 has 32 divisors (see below), whose sum is σ = 8807356800. Its totient is φ = 3202606080.

The previous prime is 5666616671. The next prime is 5666616689. The reversal of 5666616681 is 1866166665.

It is not a de Polignac number, because 5666616681 - 2⁵ = 5666616649 is a prime.

It is a super-2 number, since 2×5666616681² = 64221089218774911522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (5666616689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14815 + ... + 107483.

It is an arithmetic number, because the mean of its divisors is an integer number (275229900).

Almost surely, 2^5666616681 is an apocalyptic number.

5666616681 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5666616681 is a deficient number, since it is larger than the sum of its proper divisors (3140740119).

5666616681 is a wasteful number, since it uses less digits than its factorization.

5666616681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92809.

The product of its digits is 1866240, while the sum is 51.

The square root of 5666616681 is about 75276.9332597975. The cubic root of 5666616681 is about 1782.8218382918.

The spelling of 5666616681 in words is "five billion, six hundred sixty-six million, six hundred sixteen thousand, six hundred eighty-one".