22154009897 has 2 divisors, whose sum is σ = 22154009898. Its totient is φ = 22154009896.

The previous prime is 22154009831. The next prime is 22154009909. The reversal of 22154009897 is 79890045122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11860081216 + 10293928681 = 108904^2 + 101459^2 .

It is a cyclic number.

It is not a de Polignac number, because 22154009897 - 2⁸ = 22154009641 is a prime.

It is not a weakly prime, because it can be changed into another prime (22154009807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11077004948 + 11077004949.

It is an arithmetic number, because the mean of its divisors is an integer number (11077004949).

Almost surely, 2^22154009897 is an apocalyptic number.

It is an amenable number.

22154009897 is a deficient number, since it is larger than the sum of its proper divisors (1).

22154009897 is an equidigital number, since it uses as much as digits as its factorization.

22154009897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 22154009897 in words is "twenty-two billion, one hundred fifty-four million, nine thousand, eight hundred ninety-seven".