18518722241 has 8 divisors (see below), whose sum is σ = 19174955520. Its totient is φ = 17863666128.

The previous prime is 18518722193. The next prime is 18518722289. The reversal of 18518722241 is 14222781581.

It is an interprime number because it is at equal distance from previous prime (18518722193) and next prime (18518722289).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18518722241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18518722141) 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 7 ways as a sum of consecutive naturals, for example, 262211 + ... + 325256.

It is an arithmetic number, because the mean of its divisors is an integer number (2396869440).

Almost surely, 2^18518722241 is an apocalyptic number.

It is an amenable number.

18518722241 is a deficient number, since it is larger than the sum of its proper divisors (656233279).

18518722241 is a wasteful number, since it uses less digits than its factorization.

18518722241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588583.

The product of its digits is 71680, while the sum is 41.

The spelling of 18518722241 in words is "eighteen billion, five hundred eighteen million, seven hundred twenty-two thousand, two hundred forty-one".