181666500336 has 120 divisors (see below), whose sum is σ = 519431664960. Its totient is φ = 59244208128.

The previous prime is 181666500299. The next prime is 181666500397. The reversal of 181666500336 is 633005666181.

It is a super-2 number, since 2×181666500336² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181666500291 and 181666500300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34872900 + ... + 34878108.

It is an arithmetic number, because the mean of its divisors is an integer number (4328597208).

Almost surely, 2^181666500336 is an apocalyptic number.

181666500336 is a gapful number since it is divisible by the number (16) 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 181666500336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259715832480).

181666500336 is an abundant number, since it is smaller than the sum of its proper divisors (337765164624).

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

181666500336 is a wasteful number, since it uses less digits than its factorization.

181666500336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10423 (or 10414 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 181666500336 in words is "one hundred eighty-one billion, six hundred sixty-six million, five hundred thousand, three hundred thirty-six".