17994791854 has 16 divisors (see below), whose sum is σ = 29466711792. Its totient is φ = 8191516608.

The previous prime is 17994791821. The next prime is 17994791923. The reversal of 17994791854 is 45819749971.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 4738564 + ... + 4742359.

It is an arithmetic number, because the mean of its divisors is an integer number (1841669487).

Almost surely, 2^17994791854 is an apocalyptic number.

17994791854 is a deficient number, since it is larger than the sum of its proper divisors (11471919938).

17994791854 is a wasteful number, since it uses less digits than its factorization.

17994791854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9481011.

The product of its digits is 22861440, while the sum is 64.

The spelling of 17994791854 in words is "seventeen billion, nine hundred ninety-four million, seven hundred ninety-one thousand, eight hundred fifty-four".