181738875945 has 32 divisors (see below), whose sum is σ = 317242552320. Its totient is φ = 88108706240.

The previous prime is 181738875919. The next prime is 181738875947. The reversal of 181738875945 is 549578837181.

It is not a de Polignac number, because 181738875945 - 2⁹ = 181738875433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181738875947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2418022 + ... + 2492048.

It is an arithmetic number, because the mean of its divisors is an integer number (9913829760).

Almost surely, 2^181738875945 is an apocalyptic number.

181738875945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181738875945 is a deficient number, since it is larger than the sum of its proper divisors (135503676375).

181738875945 is a wasteful number, since it uses less digits than its factorization.

181738875945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88925.

The product of its digits is 67737600, while the sum is 66.

The spelling of 181738875945 in words is "one hundred eighty-one billion, seven hundred thirty-eight million, eight hundred seventy-five thousand, nine hundred forty-five".