22666687 has 2 divisors, whose sum is σ = 22666688. Its totient is φ = 22666686.

The previous prime is 22666663. The next prime is 22666691. The reversal of 22666687 is 78666622.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22666687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22663687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11333343 + 11333344.

It is an arithmetic number, because the mean of its divisors is an integer number (11333344).

Almost surely, 2^22666687 is an apocalyptic number.

22666687 is a deficient number, since it is larger than the sum of its proper divisors (1).

22666687 is an equidigital number, since it uses as much as digits as its factorization.

22666687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 22666687 is about 4760.9544211219. The cubic root of 22666687 is about 283.0062429169.

It can be divided in two parts, 2 and 2666687, that added together give a square (2666689 = 1633²).

The spelling of 22666687 in words is "twenty-two million, six hundred sixty-six thousand, six hundred eighty-seven".