5666678891 has 2 divisors, whose sum is σ = 5666678892. Its totient is φ = 5666678890.

The previous prime is 5666678869. The next prime is 5666678999. The reversal of 5666678891 is 1988766665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5666678891 - 2¹⁰ = 5666677867 is a prime.

It is a super-2 number, since 2×5666678891² = 64222499307409979762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5666678791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2833339445 + 2833339446.

It is an arithmetic number, because the mean of its divisors is an integer number (2833339446).

Almost surely, 2^5666678891 is an apocalyptic number.

5666678891 is a deficient number, since it is larger than the sum of its proper divisors (1).

5666678891 is an equidigital number, since it uses as much as digits as its factorization.

5666678891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 62.

The square root of 5666678891 is about 75277.3464662511. The cubic root of 5666678891 is about 1782.8283624047.

The spelling of 5666678891 in words is "five billion, six hundred sixty-six million, six hundred seventy-eight thousand, eight hundred ninety-one".