23640426513 has 72 divisors (see below), whose sum is σ = 39058699680. Its totient is φ = 13663457280.

The previous prime is 23640426503. The next prime is 23640426517. The reversal of 23640426513 is 31562404632.

23640426513 is a `hidden beast` number, since 2 + 3 + 640 + 4 + 2 + 6 + 5 + 1 + 3 = 666.

It is not a de Polignac number, because 23640426513 - 2⁴ = 23640426497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23640426517) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 30741393 + ... + 30742161.

It is an arithmetic number, because the mean of its divisors is an integer number (542481940).

Almost surely, 2^23640426513 is an apocalyptic number.

23640426513 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

23640426513 is a deficient number, since it is larger than the sum of its proper divisors (15418273167).

23640426513 is a wasteful number, since it uses less digits than its factorization.

23640426513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1393 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 23640426513 in words is "twenty-three billion, six hundred forty million, four hundred twenty-six thousand, five hundred thirteen".