2166667631 has 2 divisors, whose sum is σ = 2166667632. Its totient is φ = 2166667630.

The previous prime is 2166667627. The next prime is 2166667639. The reversal of 2166667631 is 1367666612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166667631 - 2² = 2166667627 is a prime.

It is a super-2 number, since 2×2166667631² = 9388897246446304322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166667639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083333815 + 1083333816.

It is an arithmetic number, because the mean of its divisors is an integer number (1083333816).

Almost surely, 2^2166667631 is an apocalyptic number.

2166667631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166667631 is an equidigital number, since it uses as much as digits as its factorization.

2166667631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 44.

The square root of 2166667631 is about 46547.4771711636. The cubic root of 2166667631 is about 1293.9895380843.

The spelling of 2166667631 in words is "two billion, one hundred sixty-six million, six hundred sixty-seven thousand, six hundred thirty-one".