18185401272 has 32 divisors (see below), whose sum is σ = 45821491200. Its totient is φ = 6014068704.

The previous prime is 18185401259. The next prime is 18185401291. The reversal of 18185401272 is 27210458181.

It is a self number, because there is not a number n which added to its sum of digits gives 18185401272.

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, 2980122 + ... + 2986217.

It is an arithmetic number, because the mean of its divisors is an integer number (1431921600).

Almost surely, 2^18185401272 is an apocalyptic number.

18185401272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18185401272 is an abundant number, since it is smaller than the sum of its proper divisors (27636089928).

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

18185401272 is a wasteful number, since it uses less digits than its factorization.

18185401272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5966475 (or 5966471 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The spelling of 18185401272 in words is "eighteen billion, one hundred eighty-five million, four hundred one thousand, two hundred seventy-two".