22666691 has 2 divisors, whose sum is σ = 22666692. Its totient is φ = 22666690.

The previous prime is 22666687. The next prime is 22666717. The reversal of 22666691 is 19666622.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22666691 - 2² = 22666687 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22666621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11333345 + 11333346.

It is an arithmetic number, because the mean of its divisors is an integer number (11333346).

Almost surely, 2^22666691 is an apocalyptic number.

22666691 is a deficient number, since it is larger than the sum of its proper divisors (1).

22666691 is an equidigital number, since it uses as much as digits as its factorization.

22666691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 38.

The square root of 22666691 is about 4760.9548412057. The cubic root of 22666691 is about 283.0062595643.

The spelling of 22666691 in words is "twenty-two million, six hundred sixty-six thousand, six hundred ninety-one".