181712344138668 has 72 divisors (see below), whose sum is σ = 524955360602400. Its totient is φ = 51916963184640.

The previous prime is 181712344138667. The next prime is 181712344138711. The reversal of 181712344138668 is 866831443217181.

181712344138668 is a `hidden beast` number, since 1 + 8 + 1 + 7 + 123 + 441 + 3 + 8 + 6 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (181712344138667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9615058 + ... + 21351206.

Almost surely, 2^{181712344138668} is an apocalyptic number.

181712344138668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

181712344138668 is an abundant number, since it is smaller than the sum of its proper divisors (343243016463732).

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

181712344138668 is a wasteful number, since it uses less digits than its factorization.

181712344138668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11797607 (or 11797602 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The spelling of 181712344138668 in words is "one hundred eighty-one trillion, seven hundred twelve billion, three hundred forty-four million, one hundred thirty-eight thousand, six hundred sixty-eight".