198165663649643 has 2 divisors, whose sum is σ = 198165663649644. Its totient is φ = 198165663649642.

The previous prime is 198165663649633. The next prime is 198165663649687. The reversal of 198165663649643 is 346946366561891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198165663649643 - 2¹⁸ = 198165663387499 is a prime.

It is not a weakly prime, because it can be changed into another prime (198165663649633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99082831824821 + 99082831824822.

It is an arithmetic number, because the mean of its divisors is an integer number (99082831824822).

Almost surely, 2^{198165663649643} is an apocalyptic number.

198165663649643 is a deficient number, since it is larger than the sum of its proper divisors (1).

198165663649643 is an equidigital number, since it uses as much as digits as its factorization.

198165663649643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3627970560, while the sum is 77.

The spelling of 198165663649643 in words is "one hundred ninety-eight trillion, one hundred sixty-five billion, six hundred sixty-three million, six hundred forty-nine thousand, six hundred forty-three".