17949981931923 has 16 divisors (see below), whose sum is σ = 24672368960640. Its totient is φ = 11602681602624.

The previous prime is 17949981931867. The next prime is 17949981931939. The reversal of 17949981931923 is 32913918994971.

It is not a de Polignac number, because 17949981931923 - 2¹⁸ = 17949981669779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17949981935923) 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, 694592061 + ... + 694617902.

It is an arithmetic number, because the mean of its divisors is an integer number (1542023060040).

Almost surely, 2^{17949981931923} is an apocalyptic number.

17949981931923 is a deficient number, since it is larger than the sum of its proper divisors (6722387028717).

17949981931923 is a wasteful number, since it uses less digits than its factorization.

17949981931923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389210098.

The product of its digits is 238085568, while the sum is 75.

The spelling of 17949981931923 in words is "seventeen trillion, nine hundred forty-nine billion, nine hundred eighty-one million, nine hundred thirty-one thousand, nine hundred twenty-three".