181137797394 has 16 divisors (see below), whose sum is σ = 362474341632. Its totient is φ = 60346141328.

The previous prime is 181137797389. The next prime is 181137797411. The reversal of 181137797394 is 493797731181.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8269269 + ... + 8291144.

It is an arithmetic number, because the mean of its divisors is an integer number (22654646352).

Almost surely, 2^181137797394 is an apocalyptic number.

181137797394 is an abundant number, since it is smaller than the sum of its proper divisors (181336544238).

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

181137797394 is a wasteful number, since it uses less digits than its factorization.

181137797394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16562241.

The product of its digits is 8001504, while the sum is 60.

The spelling of 181137797394 in words is "one hundred eighty-one billion, one hundred thirty-seven million, seven hundred ninety-seven thousand, three hundred ninety-four".