23365415515661 has 2 divisors, whose sum is σ = 23365415515662. Its totient is φ = 23365415515660.

The previous prime is 23365415515627. The next prime is 23365415515693. The reversal of 23365415515661 is 16651551456332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21756450113161 + 1608965402500 = 4664381^2 + 1268450^2 .

It is a cyclic number.

It is not a de Polignac number, because 23365415515661 - 2¹⁸ = 23365415253517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23365415515601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11682707757830 + 11682707757831.

It is an arithmetic number, because the mean of its divisors is an integer number (11682707757831).

Almost surely, 2^{23365415515661} is an apocalyptic number.

It is an amenable number.

23365415515661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23365415515661 is an equidigital number, since it uses as much as digits as its factorization.

23365415515661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720000, while the sum is 53.

The spelling of 23365415515661 in words is "twenty-three trillion, three hundred sixty-five billion, four hundred fifteen million, five hundred fifteen thousand, six hundred sixty-one".