19997558577368 has 16 divisors (see below), whose sum is σ = 37500000092160. Its totient is φ = 9997558552800.

The previous prime is 19997558577319. The next prime is 19997558577413. The reversal of 19997558577368 is 86377585579991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152522363 + ... + 152653418.

It is an arithmetic number, because the mean of its divisors is an integer number (2343750005760).

Almost surely, 2^{19997558577368} is an apocalyptic number.

It is an amenable number.

19997558577368 is a deficient number, since it is larger than the sum of its proper divisors (17502441514792).

19997558577368 is a wasteful number, since it uses less digits than its factorization.

19997558577368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305183978 (or 305183974 counting only the distinct ones).

The product of its digits is 36006768000, while the sum is 89.

The spelling of 19997558577368 in words is "nineteen trillion, nine hundred ninety-seven billion, five hundred fifty-eight million, five hundred seventy-seven thousand, three hundred sixty-eight".