17939964494 has 4 divisors (see below), whose sum is σ = 26909946744. Its totient is φ = 8969982246.

The previous prime is 17939964467. The next prime is 17939964571. The reversal of 17939964494 is 49446993971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49446993971 = 14251 ⋅3469721.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 17939964494.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4484991122 + ... + 4484991125.

It is an arithmetic number, because the mean of its divisors is an integer number (6727486686).

Almost surely, 2^17939964494 is an apocalyptic number.

17939964494 is a deficient number, since it is larger than the sum of its proper divisors (8969982250).

17939964494 is an equidigital number, since it uses as much as digits as its factorization.

17939964494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8969982249.

The product of its digits is 52907904, while the sum is 65.

The spelling of 17939964494 in words is "seventeen billion, nine hundred thirty-nine million, nine hundred sixty-four thousand, four hundred ninety-four".