18159380840 has 32 divisors (see below), whose sum is σ = 40932011880. Its totient is φ = 7250702592.

The previous prime is 18159380819. The next prime is 18159380867. The reversal of 18159380840 is 4808395181.

It can be written as a sum of positive squares in 4 ways, for example, as 15187604644 + 2971776196 = 123238^2 + 54514^2 .

It is a super-2 number, since 2×18159380840² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385247 + ... + 429806.

Almost surely, 2^18159380840 is an apocalyptic number.

18159380840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18159380840 is an abundant number, since it is smaller than the sum of its proper divisors (22772631040).

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

18159380840 is a wasteful number, since it uses less digits than its factorization.

18159380840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815621 (or 815617 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 18159380840 in words is "eighteen billion, one hundred fifty-nine million, three hundred eighty thousand, eight hundred forty".