198218911061 has 2 divisors, whose sum is σ = 198218911062. Its totient is φ = 198218911060.

The previous prime is 198218911039. The next prime is 198218911087. The reversal of 198218911061 is 160119812891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160813030225 + 37405880836 = 401015^2 + 193406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198218911061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198218910997 and 198218911015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198218910061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99109455530 + 99109455531.

It is an arithmetic number, because the mean of its divisors is an integer number (99109455531).

Almost surely, 2^198218911061 is an apocalyptic number.

It is an amenable number.

198218911061 is a deficient number, since it is larger than the sum of its proper divisors (1).

198218911061 is an equidigital number, since it uses as much as digits as its factorization.

198218911061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 47.

The spelling of 198218911061 in words is "one hundred ninety-eight billion, two hundred eighteen million, nine hundred eleven thousand, sixty-one".