198662671643 has 2 divisors, whose sum is σ = 198662671644. Its totient is φ = 198662671642.

The previous prime is 198662671631. The next prime is 198662671651. The reversal of 198662671643 is 346176266891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198662671643 - 2¹⁴ = 198662655259 is a prime.

It is not a weakly prime, because it can be changed into another prime (198662671043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99331335821 + 99331335822.

It is an arithmetic number, because the mean of its divisors is an integer number (99331335822).

Almost surely, 2^198662671643 is an apocalyptic number.

198662671643 is a deficient number, since it is larger than the sum of its proper divisors (1).

198662671643 is an equidigital number, since it uses as much as digits as its factorization.

198662671643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 59.

The spelling of 198662671643 in words is "one hundred ninety-eight billion, six hundred sixty-two million, six hundred seventy-one thousand, six hundred forty-three".