66331066 has 4 divisors (see below), whose sum is σ = 99496602. Its totient is φ = 33165532.

The previous prime is 66331063. The next prime is 66331079. The reversal of 66331066 is 66013366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66013366 = 2 ⋅33006683.

It can be written as a sum of positive squares in only one way, i.e., 56565441 + 9765625 = 7521^2 + 3125^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66331061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16582765 + ... + 16582768.

Almost surely, 2^66331066 is an apocalyptic number.

66331066 is a deficient number, since it is larger than the sum of its proper divisors (33165536).

66331066 is a wasteful number, since it uses less digits than its factorization.

66331066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33165535.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 66331066 is about 8144.3886203938. The cubic root of 66331066 is about 404.7985911112.

The spelling of 66331066 in words is "sixty-six million, three hundred thirty-one thousand, sixty-six".