66163966 has 32 divisors (see below), whose sum is σ = 120683520. Its totient is φ = 26812800.

The previous prime is 66163963. The next prime is 66163967. The reversal of 66163966 is 66936166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66163961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2451 + ... + 11761.

It is an arithmetic number, because the mean of its divisors is an integer number (3771360).

Almost surely, 2^66163966 is an apocalyptic number.

66163966 is a deficient number, since it is larger than the sum of its proper divisors (54519554).

66163966 is a wasteful number, since it uses less digits than its factorization.

66163966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360.

The product of its digits is 209952, while the sum is 43.

The square root of 66163966 is about 8134.1235545079. The cubic root of 66163966 is about 404.4583848851.

The spelling of 66163966 in words is "sixty-six million, one hundred sixty-three thousand, nine hundred sixty-six".