17993765894 has 16 divisors (see below), whose sum is σ = 30069159120. Its totient is φ = 8018441760.

The previous prime is 17993765843. The next prime is 17993765917. The reversal of 17993765894 is 49856739971.

It is a super-2 number, since 2×17993765894² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11931452 + ... + 11932959.

It is an arithmetic number, because the mean of its divisors is an integer number (1879322445).

Almost surely, 2^17993765894 is an apocalyptic number.

17993765894 is a deficient number, since it is larger than the sum of its proper divisors (12075393226).

17993765894 is a wasteful number, since it uses less digits than its factorization.

17993765894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23864455.

The product of its digits is 102876480, while the sum is 68.

The spelling of 17993765894 in words is "seventeen billion, nine hundred ninety-three million, seven hundred sixty-five thousand, eight hundred ninety-four".