23665220437 has 2 divisors, whose sum is σ = 23665220438. Its totient is φ = 23665220436.

The previous prime is 23665220351. The next prime is 23665220441. The reversal of 23665220437 is 73402256632.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22905611716 + 759608721 = 151346^2 + 27561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23665220437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23665220437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23665220477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11832610218 + 11832610219.

It is an arithmetic number, because the mean of its divisors is an integer number (11832610219).

Almost surely, 2^23665220437 is an apocalyptic number.

It is an amenable number.

23665220437 is a deficient number, since it is larger than the sum of its proper divisors (1).

23665220437 is an equidigital number, since it uses as much as digits as its factorization.

23665220437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 40.

The spelling of 23665220437 in words is "twenty-three billion, six hundred sixty-five million, two hundred twenty thousand, four hundred thirty-seven".