22665237808721 has 2 divisors, whose sum is σ = 22665237808722. Its totient is φ = 22665237808720.

The previous prime is 22665237808699. The next prime is 22665237808769. The reversal of 22665237808721 is 12780873256622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22631322903121 + 33914905600 = 4757239^2 + 184160^2 .

It is a cyclic number.

It is not a de Polignac number, because 22665237808721 - 2⁶ = 22665237808657 is a prime.

It is not a weakly prime, because it can be changed into another prime (22665237808771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11332618904360 + 11332618904361.

It is an arithmetic number, because the mean of its divisors is an integer number (11332618904361).

Almost surely, 2^{22665237808721} is an apocalyptic number.

It is an amenable number.

22665237808721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22665237808721 is an equidigital number, since it uses as much as digits as its factorization.

22665237808721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27095040, while the sum is 59.

The spelling of 22665237808721 in words is "twenty-two trillion, six hundred sixty-five billion, two hundred thirty-seven million, eight hundred eight thousand, seven hundred twenty-one".