198354850861 has 2 divisors, whose sum is σ = 198354850862. Its totient is φ = 198354850860.

The previous prime is 198354850843. The next prime is 198354850891. The reversal of 198354850861 is 168058453891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197807010025 + 547840836 = 444755^2 + 23406^2 .

It is a cyclic number.

It is not a de Polignac number, because 198354850861 - 2²⁵ = 198321296429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198354850796 and 198354850805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198354850891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99177425430 + 99177425431.

It is an arithmetic number, because the mean of its divisors is an integer number (99177425431).

Almost surely, 2^198354850861 is an apocalyptic number.

It is an amenable number.

198354850861 is a deficient number, since it is larger than the sum of its proper divisors (1).

198354850861 is an equidigital number, since it uses as much as digits as its factorization.

198354850861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8294400, while the sum is 58.

The spelling of 198354850861 in words is "one hundred ninety-eight billion, three hundred fifty-four million, eight hundred fifty thousand, eight hundred sixty-one".