181431887423472 has 120 divisors (see below), whose sum is σ = 586814210817120. Its totient is φ = 51255236229120.

The previous prime is 181431887423401. The next prime is 181431887423497. The reversal of 181431887423472 is 274324788134181.

It is a happy number.

181431887423472 is a `hidden beast` number, since 1 + 8 + 1 + 4 + 318 + 87 + 4 + 234 + 7 + 2 = 666.

181431887423472 is digitally balanced in base 2, 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 (63).

It is a nude number because it is divisible by every one of its digits.

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, 1011101029 + ... + 1011280452.

It is an arithmetic number, because the mean of its divisors is an integer number (4890118423476).

Almost surely, 2^{181431887423472} is an apocalyptic number.

181431887423472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181431887423472 is an abundant number, since it is smaller than the sum of its proper divisors (405382323393648).

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

181431887423472 is a wasteful number, since it uses less digits than its factorization.

181431887423472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022381591 (or 2022381582 counting only the distinct ones).

The product of its digits is 57802752, while the sum is 63.

The spelling of 181431887423472 in words is "one hundred eighty-one trillion, four hundred thirty-one billion, eight hundred eighty-seven million, four hundred twenty-three thousand, four hundred seventy-two".