18133478720 has 56 divisors (see below), whose sum is σ = 49348973184. Its totient is φ = 6217191936.

The previous prime is 18133478717. The next prime is 18133478749. The reversal of 18133478720 is 2787433181.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

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, 4045412 + ... + 4049891.

It is an arithmetic number, because the mean of its divisors is an integer number (881231664).

Almost surely, 2^18133478720 is an apocalyptic number.

18133478720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18133478720 is an abundant number, since it is smaller than the sum of its proper divisors (31215494464).

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

18133478720 is an equidigital number, since it uses as much as digits as its factorization.

18133478720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8095327 (or 8095317 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 18133478720 in words is "eighteen billion, one hundred thirty-three million, four hundred seventy-eight thousand, seven hundred twenty".