18113851800 has 576 divisors, whose sum is σ = 71105448960. Its totient is φ = 4245696000.

The previous prime is 18113851793. The next prime is 18113851801. The reversal of 18113851800 is 815831181.

It is a happy number.

18113851800 is a `hidden beast` number, since 1 + 8 + 1 + 138 + 518 + 0 + 0 = 666.

It is a super-2 number, since 2×18113851800² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18113851801) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 16572054 + ... + 16573146.

It is an arithmetic number, because the mean of its divisors is an integer number (123446960).

Almost surely, 2^18113851800 is an apocalyptic number.

18113851800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18113851800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35552724480).

18113851800 is an abundant number, since it is smaller than the sum of its proper divisors (52991597160).

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

18113851800 is a wasteful number, since it uses less digits than its factorization.

18113851800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166 (or 1145 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 36.

The spelling of 18113851800 in words is "eighteen billion, one hundred thirteen million, eight hundred fifty-one thousand, eight hundred".