181401327297920 has 64 divisors (see below), whose sum is σ = 433672105885200. Its totient is φ = 72558931703808.

The previous prime is 181401327297919. The next prime is 181401327297973. The reversal of 181401327297920 is 29792723104181.

181401327297920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

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, 26151866 + ... + 32353094.

Almost surely, 2^{181401327297920} is an apocalyptic number.

181401327297920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181401327297920 is an abundant number, since it is smaller than the sum of its proper divisors (252270778587280).

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

181401327297920 is an equidigital number, since it uses as much as digits as its factorization.

181401327297920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6246955 (or 6246943 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 181401327297920 in words is "one hundred eighty-one trillion, four hundred one billion, three hundred twenty-seven million, two hundred ninety-seven thousand, nine hundred twenty".