23981481513 has 80 divisors (see below), whose sum is σ = 40368968640. Its totient is φ = 14059785600.

The previous prime is 23981481509. The next prime is 23981481523. The reversal of 23981481513 is 31518418932.

23981481513 is a `hidden beast` number, since 2 + 3 + 98 + 1 + 48 + 1 + 513 = 666.

It is not a de Polignac number, because 23981481513 - 2² = 23981481509 is a prime.

It is a super-2 number, since 2×23981481513² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23981481523) 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 in 79 ways as a sum of consecutive naturals, for example, 5965018 + ... + 5969036.

It is an arithmetic number, because the mean of its divisors is an integer number (504612108).

Almost surely, 2^23981481513 is an apocalyptic number.

It is an amenable number.

23981481513 is a deficient number, since it is larger than the sum of its proper divisors (16387487127).

23981481513 is a wasteful number, since it uses less digits than its factorization.

23981481513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260 (or 4251 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 23981481513 in words is "twenty-three billion, nine hundred eighty-one million, four hundred eighty-one thousand, five hundred thirteen".