181997180496 has 60 divisors (see below), whose sum is σ = 517689181620. Its totient is φ = 59671203840.

The previous prime is 181997180479. The next prime is 181997180509. The reversal of 181997180496 is 694081799181.

It can be written as a sum of positive squares in 2 ways, for example, as 21327681600 + 160669498896 = 146040^2 + 400836^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10350801 + ... + 10368368.

It is an arithmetic number, because the mean of its divisors is an integer number (8628153027).

Almost surely, 2^181997180496 is an apocalyptic number.

181997180496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181997180496 is an abundant number, since it is smaller than the sum of its proper divisors (335692001124).

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

181997180496 is a wasteful number, since it uses less digits than its factorization.

181997180496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20719244 (or 20719235 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 63.

The spelling of 181997180496 in words is "one hundred eighty-one billion, nine hundred ninety-seven million, one hundred eighty thousand, four hundred ninety-six".