23891700002561 has 2 divisors, whose sum is σ = 23891700002562. Its totient is φ = 23891700002560.

The previous prime is 23891700002557. The next prime is 23891700002609. The reversal of 23891700002561 is 16520000719832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22669558697536 + 1222141305025 = 4761256^2 + 1105505^2 .

It is a cyclic number.

It is not a de Polignac number, because 23891700002561 - 2² = 23891700002557 is a prime.

It is not a weakly prime, because it can be changed into another prime (23891700002531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11945850001280 + 11945850001281.

It is an arithmetic number, because the mean of its divisors is an integer number (11945850001281).

Almost surely, 2^{23891700002561} is an apocalyptic number.

It is an amenable number.

23891700002561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23891700002561 is an equidigital number, since it uses as much as digits as its factorization.

23891700002561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 23891700002561 in words is "twenty-three trillion, eight hundred ninety-one billion, seven hundred million, two thousand, five hundred sixty-one".