23698923581 has 2 divisors, whose sum is σ = 23698923582. Its totient is φ = 23698923580.

The previous prime is 23698923541. The next prime is 23698923587. The reversal of 23698923581 is 18532989632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17931888100 + 5767035481 = 133910^2 + 75941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23698923581 is a prime.

It is a super-2 number, since 2×23698923581² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23698923587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11849461790 + 11849461791.

It is an arithmetic number, because the mean of its divisors is an integer number (11849461791).

Almost surely, 2^23698923581 is an apocalyptic number.

It is an amenable number.

23698923581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23698923581 is an equidigital number, since it uses as much as digits as its factorization.

23698923581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 56.

The spelling of 23698923581 in words is "twenty-three billion, six hundred ninety-eight million, nine hundred twenty-three thousand, five hundred eighty-one".