17979049998786 has 16 divisors (see below), whose sum is σ = 35963149668768. Its totient is φ = 5992175054400.

The previous prime is 17979049998743. The next prime is 17979049998821. The reversal of 17979049998786 is 68789994097971.

It is a self number, because there is not a number n which added to its sum of digits gives 17979049998786.

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, 210356680 + ... + 210442131.

It is an arithmetic number, because the mean of its divisors is an integer number (2247696854298).

Almost surely, 2^{17979049998786} is an apocalyptic number.

17979049998786 is an abundant number, since it is smaller than the sum of its proper divisors (17984099669982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17979049998786 is a wasteful number, since it uses less digits than its factorization.

17979049998786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420805937.

The product of its (nonzero) digits is 31109847552, while the sum is 93.

The spelling of 17979049998786 in words is "seventeen trillion, nine hundred seventy-nine billion, forty-nine million, nine hundred ninety-eight thousand, seven hundred eighty-six".