199168643 has 2 divisors, whose sum is σ = 199168644. Its totient is φ = 199168642.

The previous prime is 199168591. The next prime is 199168649. The reversal of 199168643 is 346861991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199168643 - 2²⁰ = 198120067 is a prime.

It is a super-2 number, since 2×199168643² = 79336296708922898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199168649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99584321 + 99584322.

It is an arithmetic number, because the mean of its divisors is an integer number (99584322).

Almost surely, 2^199168643 is an apocalyptic number.

199168643 is a deficient number, since it is larger than the sum of its proper divisors (1).

199168643 is an equidigital number, since it uses as much as digits as its factorization.

199168643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 199168643 is about 14112.7121064663. The cubic root of 199168643 is about 583.9921214221.

The spelling of 199168643 in words is "one hundred ninety-nine million, one hundred sixty-eight thousand, six hundred forty-three".