198655556831 has 2 divisors, whose sum is σ = 198655556832. Its totient is φ = 198655556830.

The previous prime is 198655556747. The next prime is 198655556833. The reversal of 198655556831 is 138655556891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198655556831 is a prime.

It is a super-2 number, since 2×198655556831² (a number of 23 digits) contains 22 as substring.

Together with 198655556833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198655556833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99327778415 + 99327778416.

It is an arithmetic number, because the mean of its divisors is an integer number (99327778416).

Almost surely, 2^198655556831 is an apocalyptic number.

198655556831 is a deficient number, since it is larger than the sum of its proper divisors (1).

198655556831 is an equidigital number, since it uses as much as digits as its factorization.

198655556831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880000, while the sum is 62.

The spelling of 198655556831 in words is "one hundred ninety-eight billion, six hundred fifty-five million, five hundred fifty-six thousand, eight hundred thirty-one".