18512280100 has 36 divisors (see below), whose sum is σ = 41026374144. Its totient is φ = 7247358880.

The previous prime is 18512280071. The next prime is 18512280103. The reversal of 18512280100 is 108221581.

It is not an unprimeable number, because it can be changed into a prime (18512280103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1964692 + ... + 1974091.

It is an arithmetic number, because the mean of its divisors is an integer number (1139621504).

Almost surely, 2^18512280100 is an apocalyptic number.

18512280100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18512280100 is an abundant number, since it is smaller than the sum of its proper divisors (22514094044).

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

18512280100 is a wasteful number, since it uses less digits than its factorization.

18512280100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938844 (or 3938837 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 28.

The spelling of 18512280100 in words is "eighteen billion, five hundred twelve million, two hundred eighty thousand, one hundred".