18556718740 has 48 divisors (see below), whose sum is σ = 44543866752. Its totient is φ = 6361197696.

The previous prime is 18556718731. The next prime is 18556718749. The reversal of 18556718740 is 4781765581.

It is an interprime number because it is at equal distance from previous prime (18556718731) and next prime (18556718749).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18556718749) 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, 1550419 + ... + 1562341.

It is an arithmetic number, because the mean of its divisors is an integer number (927997224).

Almost surely, 2^18556718740 is an apocalyptic number.

18556718740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18556718740 is an abundant number, since it is smaller than the sum of its proper divisors (25987148012).

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

18556718740 is a wasteful number, since it uses less digits than its factorization.

18556718740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23056 (or 23054 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 18556718740 in words is "eighteen billion, five hundred fifty-six million, seven hundred eighteen thousand, seven hundred forty".