23626217561 has 2 divisors, whose sum is σ = 23626217562. Its totient is φ = 23626217560.

The previous prime is 23626217557. The next prime is 23626217599. The reversal of 23626217561 is 16571262632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14283835225 + 9342382336 = 119515^2 + 96656^2 .

It is a cyclic number.

It is not a de Polignac number, because 23626217561 - 2² = 23626217557 is a prime.

It is a super-3 number, since 3×23626217561³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (23626217521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11813108780 + 11813108781.

It is an arithmetic number, because the mean of its divisors is an integer number (11813108781).

Almost surely, 2^23626217561 is an apocalyptic number.

It is an amenable number.

23626217561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23626217561 is an equidigital number, since it uses as much as digits as its factorization.

23626217561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The spelling of 23626217561 in words is "twenty-three billion, six hundred twenty-six million, two hundred seventeen thousand, five hundred sixty-one".