23709981618 has 96 divisors (see below), whose sum is σ = 56227032576. Its totient is φ = 7198671744.

The previous prime is 23709981577. The next prime is 23709981619. The reversal of 23709981618 is 81618990732.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23709981619) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 703480 + ... + 736412.

It is an arithmetic number, because the mean of its divisors is an integer number (585698256).

Almost surely, 2^23709981618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23709981618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28113516288).

23709981618 is an abundant number, since it is smaller than the sum of its proper divisors (32517050958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23709981618 is a wasteful number, since it uses less digits than its factorization.

23709981618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33048 (or 33045 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 23709981618 in words is "twenty-three billion, seven hundred nine million, nine hundred eighty-one thousand, six hundred eighteen".