23518494721 has 4 divisors (see below), whose sum is σ = 23574625200. Its totient is φ = 23462364244.

The previous prime is 23518494719. The next prime is 23518494731. The reversal of 23518494721 is 12749481532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23518494721 - 2¹ = 23518494719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23518494731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28064611 + ... + 28065448.

It is an arithmetic number, because the mean of its divisors is an integer number (5893656300).

Almost surely, 2^23518494721 is an apocalyptic number.

It is an amenable number.

23518494721 is a deficient number, since it is larger than the sum of its proper divisors (56130479).

23518494721 is an equidigital number, since it uses as much as digits as its factorization.

23518494721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56130478.

The product of its digits is 483840, while the sum is 46.

The spelling of 23518494721 in words is "twenty-three billion, five hundred eighteen million, four hundred ninety-four thousand, seven hundred twenty-one".