23440240357 has 2 divisors, whose sum is σ = 23440240358. Its totient is φ = 23440240356.

The previous prime is 23440240319. The next prime is 23440240361. The reversal of 23440240357 is 75304204432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22958613441 + 481626916 = 151521^2 + 21946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23440240357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23440240157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11720120178 + 11720120179.

It is an arithmetic number, because the mean of its divisors is an integer number (11720120179).

Almost surely, 2^23440240357 is an apocalyptic number.

It is an amenable number.

23440240357 is a deficient number, since it is larger than the sum of its proper divisors (1).

23440240357 is an equidigital number, since it uses as much as digits as its factorization.

23440240357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 34.

Adding to 23440240357 its reverse (75304204432), we get a palindrome (98744444789).

The spelling of 23440240357 in words is "twenty-three billion, four hundred forty million, two hundred forty thousand, three hundred fifty-seven".