23166222509 has 2 divisors, whose sum is σ = 23166222510. Its totient is φ = 23166222508.

The previous prime is 23166222503. The next prime is 23166222539. The reversal of 23166222509 is 90522266132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13296396100 + 9869826409 = 115310^2 + 99347^2 .

It is a cyclic number.

It is not a de Polignac number, because 23166222509 - 2³² = 18871255213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23166222503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11583111254 + 11583111255.

It is an arithmetic number, because the mean of its divisors is an integer number (11583111255).

Almost surely, 2^23166222509 is an apocalyptic number.

It is an amenable number.

23166222509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23166222509 is an equidigital number, since it uses as much as digits as its factorization.

23166222509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 23166222509 in words is "twenty-three billion, one hundred sixty-six million, two hundred twenty-two thousand, five hundred nine".