163791266 has 4 divisors (see below), whose sum is σ = 245686902. Its totient is φ = 81895632.

The previous prime is 163791263. The next prime is 163791281. The reversal of 163791266 is 662197361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662197361 = 7 ⋅94599623.

It can be written as a sum of positive squares in only one way, i.e., 124791241 + 39000025 = 11171^2 + 6245^2 .

It is not an unprimeable number, because it can be changed into a prime (163791263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40947815 + ... + 40947818.

Almost surely, 2^163791266 is an apocalyptic number.

163791266 is a deficient number, since it is larger than the sum of its proper divisors (81895636).

163791266 is an equidigital number, since it uses as much as digits as its factorization.

163791266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81895635.

The product of its digits is 81648, while the sum is 41.

The square root of 163791266 is about 12798.0961865427. The cubic root of 163791266 is about 547.1380436711.

The spelling of 163791266 in words is "one hundred sixty-three million, seven hundred ninety-one thousand, two hundred sixty-six".