18100082561 has 8 divisors (see below), whose sum is σ = 20382498048. Its totient is φ = 15923826000.

The previous prime is 18100082543. The next prime is 18100082593. The reversal of 18100082561 is 16528000181.

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-18100082561 is a prime.

It is a super-2 number, since 2×18100082561² (a number of 21 digits) contains 22 as substring.

It is a Curzon 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26539370 + ... + 26540051.

It is an arithmetic number, because the mean of its divisors is an integer number (2547812256).

Almost surely, 2^18100082561 is an apocalyptic number.

18100082561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18100082561 is a deficient number, since it is larger than the sum of its proper divisors (2282415487).

18100082561 is a wasteful number, since it uses less digits than its factorization.

18100082561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53079463.

The product of its (nonzero) digits is 3840, while the sum is 32.

The spelling of 18100082561 in words is "eighteen billion, one hundred million, eighty-two thousand, five hundred sixty-one".