66326669 has 4 divisors (see below), whose sum is σ = 66347100. Its totient is φ = 66306240.

The previous prime is 66326647. The next prime is 66326713. The reversal of 66326669 is 96662366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4515625 + 61811044 = 2125^2 + 7862^2 .

It is a cyclic number.

It is not a de Polignac number, because 66326669 - 2²⁰ = 65278093 is a prime.

It is a super-2 number, since 2×66326669² = 8798454041271122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66326269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4142 + ... + 12239.

It is an arithmetic number, because the mean of its divisors is an integer number (16586775).

Almost surely, 2^66326669 is an apocalyptic number.

It is an amenable number.

66326669 is a deficient number, since it is larger than the sum of its proper divisors (20431).

66326669 is a wasteful number, since it uses less digits than its factorization.

66326669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20430.

The product of its digits is 419904, while the sum is 44.

The square root of 66326669 is about 8144.1186754615. The cubic root of 66326669 is about 404.7896463897.

The spelling of 66326669 in words is "sixty-six million, three hundred twenty-six thousand, six hundred sixty-nine".