17981999101 has 16 divisors (see below), whose sum is σ = 20774890368. Its totient is φ = 15382528000.

The previous prime is 17981999099. The next prime is 17981999107. The reversal of 17981999101 is 10199918971.

It is a cyclic number.

It is not a de Polignac number, because 17981999101 - 2¹ = 17981999099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17981999107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1766376 + ... + 1776526.

It is an arithmetic number, because the mean of its divisors is an integer number (1298430648).

Almost surely, 2^17981999101 is an apocalyptic number.

17981999101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

17981999101 is a deficient number, since it is larger than the sum of its proper divisors (2792891267).

17981999101 is a wasteful number, since it uses less digits than its factorization.

17981999101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19652.

The product of its (nonzero) digits is 367416, while the sum is 55.

The spelling of 17981999101 in words is "seventeen billion, nine hundred eighty-one million, nine hundred ninety-nine thousand, one hundred one".