199171066 has 4 divisors (see below), whose sum is σ = 298756602. Its totient is φ = 99585532.

The previous prime is 199171061. The next prime is 199171067. The reversal of 199171066 is 660171991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660171991 = 43 ⋅15352837.

It can be written as a sum of positive squares in only one way, i.e., 191020041 + 8151025 = 13821^2 + 2855^2 .

It is a super-2 number, since 2×199171066² = 79338227063152712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199171061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49792765 + ... + 49792768.

Almost surely, 2^199171066 is an apocalyptic number.

199171066 is a deficient number, since it is larger than the sum of its proper divisors (99585536).

199171066 is an equidigital number, since it uses as much as digits as its factorization.

199171066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99585535.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 199171066 is about 14112.7979507963. The cubic root of 199171066 is about 583.9944896115.

The spelling of 199171066 in words is "one hundred ninety-nine million, one hundred seventy-one thousand, sixty-six".