199778634370248 has 32 divisors (see below), whose sum is σ = 499447080626400. Its totient is φ = 66592812163328.

The previous prime is 199778634370219. The next prime is 199778634370331. The reversal of 199778634370248 is 842073436877991.

It is a Cunningham number, because it is equal to 14134307²-1.

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, 24735040 + ... + 31802192.

It is an arithmetic number, because the mean of its divisors is an integer number (15607721269575).

Almost surely, 2^{199778634370248} is an apocalyptic number.

It is an amenable number.

199778634370248 is an abundant number, since it is smaller than the sum of its proper divisors (299668446256152).

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

199778634370248 is a wasteful number, since it uses less digits than its factorization.

199778634370248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8245021 (or 8245017 counting only the distinct ones).

The product of its (nonzero) digits is 3072577536, while the sum is 78.

The spelling of 199778634370248 in words is "one hundred ninety-nine trillion, seven hundred seventy-eight billion, six hundred thirty-four million, three hundred seventy thousand, two hundred forty-eight".