23665222251 has 16 divisors (see below), whose sum is σ = 38246824320. Its totient is φ = 14342558760.

The previous prime is 23665222223. The next prime is 23665222297. The reversal of 23665222251 is 15222256632.

23665222251 is a `hidden beast` number, since 2 + 3 + 66 + 522 + 22 + 51 = 666.

It is not a de Polignac number, because 23665222251 - 2¹¹ = 23665220203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23665222051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39840145 + ... + 39840738.

It is an arithmetic number, because the mean of its divisors is an integer number (2390426520).

Almost surely, 2^23665222251 is an apocalyptic number.

23665222251 is a deficient number, since it is larger than the sum of its proper divisors (14581602069).

23665222251 is a wasteful number, since it uses less digits than its factorization.

23665222251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79680903 (or 79680897 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

Adding to 23665222251 its reverse (15222256632), we get a palindrome (38887478883).

The spelling of 23665222251 in words is "twenty-three billion, six hundred sixty-five million, two hundred twenty-two thousand, two hundred fifty-one".