198693743878 has 32 divisors (see below), whose sum is σ = 345518208000. Its totient is φ = 83933051904.

The previous prime is 198693743869. The next prime is 198693743887. The reversal of 198693743878 is 878347396891.

It is an interprime number because it is at equal distance from previous prime (198693743869) and next prime (198693743887).

It is a self number, because there is not a number n which added to its sum of digits gives 198693743878.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496198 + ... + 802246.

It is an arithmetic number, because the mean of its divisors is an integer number (10797444000).

Almost surely, 2^198693743878 is an apocalyptic number.

198693743878 is a deficient number, since it is larger than the sum of its proper divisors (146824464122).

198693743878 is a wasteful number, since it uses less digits than its factorization.

198693743878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306724.

The product of its digits is 438939648, while the sum is 73.

The spelling of 198693743878 in words is "one hundred ninety-eight billion, six hundred ninety-three million, seven hundred forty-three thousand, eight hundred seventy-eight".