181151533149 has 8 divisors (see below), whose sum is σ = 241864896672. Its totient is φ = 120602929200.

The previous prime is 181151533141. The next prime is 181151533187. The reversal of 181151533149 is 941335151181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 181151533149 - 2³ = 181151533141 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 181151533149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181151533141) 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, 41187327 + ... + 41191724.

It is an arithmetic number, because the mean of its divisors is an integer number (30233112084).

Almost surely, 2^181151533149 is an apocalyptic number.

It is an amenable number.

181151533149 is a deficient number, since it is larger than the sum of its proper divisors (60713363523).

181151533149 is an equidigital number, since it uses as much as digits as its factorization.

181151533149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82379787.

The product of its digits is 64800, while the sum is 42.

The spelling of 181151533149 in words is "one hundred eighty-one billion, one hundred fifty-one million, five hundred thirty-three thousand, one hundred forty-nine".