181867324157 has 8 divisors (see below), whose sum is σ = 183095835384. Its totient is φ = 180640850688.

The previous prime is 181867324141. The next prime is 181867324193. The reversal of 181867324157 is 751423768181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 160084811236 + 21782512921 = 400106^2 + 147589^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 181867324157 - 2⁴ = 181867324141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181867324099 and 181867324108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181867324117) 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, 330128 + ... + 687545.

It is an arithmetic number, because the mean of its divisors is an integer number (22886979423).

Almost surely, 2^181867324157 is an apocalyptic number.

It is an amenable number.

181867324157 is a deficient number, since it is larger than the sum of its proper divisors (1228511227).

181867324157 is a wasteful number, since it uses less digits than its factorization.

181867324157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018879.

The product of its digits is 2257920, while the sum is 53.

The spelling of 181867324157 in words is "one hundred eighty-one billion, eight hundred sixty-seven million, three hundred twenty-four thousand, one hundred fifty-seven".