181555506670272 has 112 divisors (see below), whose sum is σ = 567919934780160. Its totient is φ = 50084277691392.

The previous prime is 181555506670249. The next prime is 181555506670303. The reversal of 181555506670272 is 272076605555181.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2329028998 + ... + 2329106949.

Almost surely, 2^{181555506670272} is an apocalyptic number.

181555506670272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181555506670272 is an abundant number, since it is smaller than the sum of its proper divisors (386364428109888).

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

181555506670272 is a wasteful number, since it uses less digits than its factorization.

181555506670272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658135998 (or 4658135988 counting only the distinct ones).

The product of its (nonzero) digits is 35280000, while the sum is 60.

The spelling of 181555506670272 in words is "one hundred eighty-one trillion, five hundred fifty-five billion, five hundred six million, six hundred seventy thousand, two hundred seventy-two".