18641395081 has 8 divisors (see below), whose sum is σ = 18805309280. Its totient is φ = 18478085472.

The previous prime is 18641395063. The next prime is 18641395099. The reversal of 18641395081 is 18059314681.

It is an interprime number because it is at equal distance from previous prime (18641395063) and next prime (18641395099).

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 18641395081 - 2⁷ = 18641394953 is a prime.

It is a super-2 number, since 2×18641395081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18641395001) 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, 89100 + ... + 212653.

It is an arithmetic number, because the mean of its divisors is an integer number (2350663660).

Almost surely, 2^18641395081 is an apocalyptic number.

It is an amenable number.

18641395081 is a deficient number, since it is larger than the sum of its proper divisors (163914199).

18641395081 is a wasteful number, since it uses less digits than its factorization.

18641395081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302295.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 18641395081 in words is "eighteen billion, six hundred forty-one million, three hundred ninety-five thousand, eighty-one".