18681433830 has 48 divisors (see below), whose sum is σ = 48596281344. Its totient is φ = 4979197440.

The previous prime is 18681433777. The next prime is 18681433853. The reversal of 18681433830 is 3833418681.

18681433830 is a `hidden beast` number, since 186 + 8 + 1 + 433 + 8 + 30 = 666.

18681433830 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130075 + ... + 232985.

It is an arithmetic number, because the mean of its divisors is an integer number (1012422528).

Almost surely, 2^18681433830 is an apocalyptic number.

18681433830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18681433830 is an abundant number, since it is smaller than the sum of its proper divisors (29914847514).

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

18681433830 is a wasteful number, since it uses less digits than its factorization.

18681433830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104941 (or 104938 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 18681433830 in words is "eighteen billion, six hundred eighty-one million, four hundred thirty-three thousand, eight hundred thirty".