22665997 has 2 divisors, whose sum is σ = 22665998. Its totient is φ = 22665996.

The previous prime is 22665977. The next prime is 22666003. The reversal of 22665997 is 79956622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15515721 + 7150276 = 3939^2 + 2674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22665997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22665977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11332998 + 11332999.

It is an arithmetic number, because the mean of its divisors is an integer number (11332999).

Almost surely, 2^22665997 is an apocalyptic number.

It is an amenable number.

22665997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22665997 is an equidigital number, since it uses as much as digits as its factorization.

22665997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 46.

The square root of 22665997 is about 4760.8819561086. The cubic root of 22665997 is about 283.0033712093.

The spelling of 22665997 in words is "twenty-two million, six hundred sixty-five thousand, nine hundred ninety-seven".