181662630552 has 192 divisors, whose sum is σ = 547329722400. Its totient is φ = 55803271680.

The previous prime is 181662630533. The next prime is 181662630563. The reversal of 181662630552 is 255036266181.

181662630552 is a `hidden beast` number, since 1 + 8 + 1 + 6 + 6 + 2 + 630 + 5 + 5 + 2 = 666.

It is a super-2 number, since 2×181662630552² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181662630498 and 181662630507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23833302 + ... + 23840922.

Almost surely, 2^181662630552 is an apocalyptic number.

181662630552 is a gapful number since it is divisible by the number (12) 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 181662630552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273664861200).

181662630552 is an abundant number, since it is smaller than the sum of its proper divisors (365667091848).

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

181662630552 is a wasteful number, since it uses less digits than its factorization.

181662630552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8315 (or 8292 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 181662630552 in words is "one hundred eighty-one billion, six hundred sixty-two million, six hundred thirty thousand, five hundred fifty-two".