18357351181 has 4 divisors (see below), whose sum is σ = 19769455132. Its totient is φ = 16945247232.

The previous prime is 18357351073. The next prime is 18357351191. The reversal of 18357351181 is 18115375381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18115375381 = 1571 ⋅11531111.

It can be written as a sum of positive squares in 2 ways, for example, as 1106892900 + 17250458281 = 33270^2 + 131341^2 .

It is a cyclic number.

It is not a de Polignac number, because 18357351181 - 2⁷ = 18357351053 is a prime.

It is a super-2 number, since 2×18357351181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18357351191) 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 3 ways as a sum of consecutive naturals, for example, 706051956 + ... + 706051981.

It is an arithmetic number, because the mean of its divisors is an integer number (4942363783).

Almost surely, 2^18357351181 is an apocalyptic number.

It is an amenable number.

18357351181 is a deficient number, since it is larger than the sum of its proper divisors (1412103951).

18357351181 is a wasteful number, since it uses less digits than its factorization.

18357351181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412103950.

The product of its digits is 100800, while the sum is 43.

The spelling of 18357351181 in words is "eighteen billion, three hundred fifty-seven million, three hundred fifty-one thousand, one hundred eighty-one".