181873399994 has 16 divisors (see below), whose sum is σ = 320504173920. Its totient is φ = 76310517360.

The previous prime is 181873399963. The next prime is 181873399999. The reversal of 181873399994 is 499993378181.

It is not an unprimeable number, because it can be changed into a prime (181873399999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317960204 + ... + 317960775.

It is an arithmetic number, because the mean of its divisors is an integer number (20031510870).

Almost surely, 2^181873399994 is an apocalyptic number.

181873399994 is a deficient number, since it is larger than the sum of its proper divisors (138630773926).

181873399994 is a wasteful number, since it uses less digits than its factorization.

181873399994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635921005.

The product of its digits is 105815808, while the sum is 71.

The spelling of 181873399994 in words is "one hundred eighty-one billion, eight hundred seventy-three million, three hundred ninety-nine thousand, nine hundred ninety-four".