1663166 has 4 divisors (see below), whose sum is σ = 2494752. Its totient is φ = 831582.

The previous prime is 1663157. The next prime is 1663169. The reversal of 1663166 is 6613661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6613661 = 263 ⋅25147.

It is a super-2 number, since 2×1663166² = 5532242287112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663169) 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, 415790 + ... + 415793.

It is an arithmetic number, because the mean of its divisors is an integer number (623688).

2^1663166 is an apocalyptic number.

1663166 is a deficient number, since it is larger than the sum of its proper divisors (831586).

1663166 is an equidigital number, since it uses as much as digits as its factorization.

1663166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831585.

The product of its digits is 3888, while the sum is 29.

The square root of 1663166 is about 1289.6379336853. The cubic root of 1663166 is about 118.4800419782.

The spelling of 1663166 in words is "one million, six hundred sixty-three thousand, one hundred sixty-six".