181994575000 has 576 divisors, whose sum is σ = 528997392000. Its totient is φ = 58423680000.

The previous prime is 181994574973. The next prime is 181994575001. The reversal of 181994575000 is 575499181.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181994575001) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1669674946 + ... + 1669675054.

It is an arithmetic number, because the mean of its divisors is an integer number (918398250).

Almost surely, 2^181994575000 is an apocalyptic number.

181994575000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181994575000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264498696000).

181994575000 is an abundant number, since it is smaller than the sum of its proper divisors (347002817000).

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

181994575000 is a wasteful number, since it uses less digits than its factorization.

181994575000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 49.

The spelling of 181994575000 in words is "one hundred eighty-one billion, nine hundred ninety-four million, five hundred seventy-five thousand".