181823139072 has 90 divisors (see below), whose sum is σ = 542163763218. Its totient is φ = 60607706112.

The previous prime is 181823139067. The next prime is 181823139083. The reversal of 181823139072 is 270931328181.

181823139072 is a `hidden beast` number, since 1 + 8 + 182 + 313 + 90 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 124061746176 + 57761392896 = 352224^2 + 240336^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4363503 + ... + 4404974.

Almost surely, 2^181823139072 is an apocalyptic number.

181823139072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181823139072 is an abundant number, since it is smaller than the sum of its proper divisors (360340624146).

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

181823139072 is an frugal number, since it uses more digits than its factorization.

181823139072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8768505 (or 8768482 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 181823139072 in words is "one hundred eighty-one billion, eight hundred twenty-three million, one hundred thirty-nine thousand, seventy-two".