23540520569 has 2 divisors, whose sum is σ = 23540520570. Its totient is φ = 23540520568.

The previous prime is 23540520481. The next prime is 23540520571. The reversal of 23540520569 is 96502504532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21737668969 + 1802851600 = 147437^2 + 42460^2 .

It is a cyclic number.

It is not a de Polignac number, because 23540520569 - 2¹² = 23540516473 is a prime.

It is a super-2 number, since 2×23540520569² (a number of 22 digits) contains 22 as substring.

Together with 23540520571, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23540420569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11770260284 + 11770260285.

It is an arithmetic number, because the mean of its divisors is an integer number (11770260285).

Almost surely, 2^23540520569 is an apocalyptic number.

It is an amenable number.

23540520569 is a deficient number, since it is larger than the sum of its proper divisors (1).

23540520569 is an equidigital number, since it uses as much as digits as its factorization.

23540520569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 23540520569 in words is "twenty-three billion, five hundred forty million, five hundred twenty thousand, five hundred sixty-nine".