181851844968 has 24 divisors (see below), whose sum is σ = 492515413650. Its totient is φ = 60617281632.

The previous prime is 181851844963. The next prime is 181851844981. The reversal of 181851844968 is 869448158181.

181851844968 is a `hidden beast` number, since 1 + 8 + 18 + 51 + 84 + 496 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 179726819364 + 2125025604 = 423942^2 + 46098^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (181851844963) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1262859963 + ... + 1262860106.

Almost surely, 2^181851844968 is an apocalyptic number.

181851844968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

181851844968 is an abundant number, since it is smaller than the sum of its proper divisors (310663568682).

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

181851844968 is a wasteful number, since it uses less digits than its factorization.

181851844968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525720081 (or 2525720074 counting only the distinct ones).

The product of its digits is 17694720, while the sum is 63.

The spelling of 181851844968 in words is "one hundred eighty-one billion, eight hundred fifty-one million, eight hundred forty-four thousand, nine hundred sixty-eight".