18718969140 has 36 divisors (see below), whose sum is σ = 56780873604. Its totient is φ = 4991725056.

The previous prime is 18718969123. The next prime is 18718969147. The reversal of 18718969140 is 4196981781.

It can be written as a sum of positive squares in 2 ways, for example, as 2870173476 + 15848795664 = 53574^2 + 125892^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×18718969140³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18718969147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51996957 + ... + 51997316.

It is an arithmetic number, because the mean of its divisors is an integer number (1577246489).

Almost surely, 2^18718969140 is an apocalyptic number.

18718969140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18718969140 is an abundant number, since it is smaller than the sum of its proper divisors (38061904464).

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

18718969140 is a wasteful number, since it uses less digits than its factorization.

18718969140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103994288 (or 103994283 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 18718969140 in words is "eighteen billion, seven hundred eighteen million, nine hundred sixty-nine thousand, one hundred forty".