18857444718 has 128 divisors (see below), whose sum is σ = 47469818880. Its totient is φ = 4871301120.

The previous prime is 18857444717. The next prime is 18857444719. The reversal of 18857444718 is 81744475881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18857444717) and next prime (18857444719).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18857444717) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1867788 + ... + 1877856.

It is an arithmetic number, because the mean of its divisors is an integer number (370857960).

Almost surely, 2^18857444718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18857444718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23734909440).

18857444718 is an abundant number, since it is smaller than the sum of its proper divisors (28612374162).

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

18857444718 is a wasteful number, since it uses less digits than its factorization.

18857444718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202.

The product of its digits is 8028160, while the sum is 57.

The spelling of 18857444718 in words is "eighteen billion, eight hundred fifty-seven million, four hundred forty-four thousand, seven hundred eighteen".