18100082581 has 8 divisors (see below), whose sum is σ = 20687454144. Its totient is φ = 15513122400.

The previous prime is 18100082543. The next prime is 18100082593. The reversal of 18100082581 is 18528000181.

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 18100082581 - 2²¹ = 18097985429 is a prime.

It is a super-2 number, since 2×18100082581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18100082501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1960 + ... + 190273.

It is an arithmetic number, because the mean of its divisors is an integer number (2585931768).

Almost surely, 2^18100082581 is an apocalyptic number.

It is an amenable number.

18100082581 is a deficient number, since it is larger than the sum of its proper divisors (2587371563).

18100082581 is a wasteful number, since it uses less digits than its factorization.

18100082581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205691.

The product of its (nonzero) digits is 5120, while the sum is 34.

The spelling of 18100082581 in words is "eighteen billion, one hundred million, eighty-two thousand, five hundred eighty-one".