18388981760 has 192 divisors, whose sum is σ = 46447914240. Its totient is φ = 6977617920.

The previous prime is 18388981727. The next prime is 18388981769. The reversal of 18388981760 is 6718988381.

It is a super-2 number, since 2×18388981760² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18388981760.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18388981769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16823774 + ... + 16824866.

It is an arithmetic number, because the mean of its divisors is an integer number (241916220).

Almost surely, 2^18388981760 is an apocalyptic number.

18388981760 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 18388981760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23223957120).

18388981760 is an abundant number, since it is smaller than the sum of its proper divisors (28058932480).

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

18388981760 is a wasteful number, since it uses less digits than its factorization.

18388981760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204 (or 1184 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 59.

The spelling of 18388981760 in words is "eighteen billion, three hundred eighty-eight million, nine hundred eighty-one thousand, seven hundred sixty".