181691047992 has 32 divisors (see below), whose sum is σ = 461926396800. Its totient is φ = 59537179104.

The previous prime is 181691047991. The next prime is 181691047999. The reversal of 181691047992 is 299740196181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181691047991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64155028 + ... + 64157859.

It is an arithmetic number, because the mean of its divisors is an integer number (14435199900).

Almost surely, 2^181691047992 is an apocalyptic number.

181691047992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181691047992 is an abundant number, since it is smaller than the sum of its proper divisors (280235348808).

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

181691047992 is a wasteful number, since it uses less digits than its factorization.

181691047992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128312955 (or 128312951 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 57.

The spelling of 181691047992 in words is "one hundred eighty-one billion, six hundred ninety-one million, forty-seven thousand, nine hundred ninety-two".