181866645324 has 432 divisors, whose sum is σ = 594814252032. Its totient is φ = 45830873088.

The previous prime is 181866645313. The next prime is 181866645329. The reversal of 181866645324 is 423546668181.

It is a super-2 number, since 2×181866645324² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181866645329) 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, 86069292 + ... + 86071404.

Almost surely, 2^181866645324 is an apocalyptic number.

181866645324 is a gapful number since it is divisible by the number (14) 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 181866645324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297407126016).

181866645324 is an abundant number, since it is smaller than the sum of its proper divisors (412947606708).

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

181866645324 is a wasteful number, since it uses less digits than its factorization.

181866645324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246 (or 2228 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 54.

The spelling of 181866645324 in words is "one hundred eighty-one billion, eight hundred sixty-six million, six hundred forty-five thousand, three hundred twenty-four".