198394634887 has 2 divisors, whose sum is σ = 198394634888. Its totient is φ = 198394634886.

The previous prime is 198394634869. The next prime is 198394634899. The reversal of 198394634887 is 788436493891.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (788436493891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198394634887 - 2⁷ = 198394634759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198394634827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99197317443 + 99197317444.

It is an arithmetic number, because the mean of its divisors is an integer number (99197317444).

Almost surely, 2^198394634887 is an apocalyptic number.

198394634887 is a deficient number, since it is larger than the sum of its proper divisors (1).

198394634887 is an equidigital number, since it uses as much as digits as its factorization.

198394634887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 250822656, while the sum is 70.

The spelling of 198394634887 in words is "one hundred ninety-eight billion, three hundred ninety-four million, six hundred thirty-four thousand, eight hundred eighty-seven".