66665306 has 4 divisors (see below), whose sum is σ = 99997962. Its totient is φ = 33332652.

The previous prime is 66665273. The next prime is 66665311. The reversal of 66665306 is 60356666.

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

It can be written as a sum of positive squares in only one way, i.e., 51912025 + 14753281 = 7205^2 + 3841^2 .

It is a super-3 number, since 3×66665306³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66665306.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16666325 + ... + 16666328.

Almost surely, 2^66665306 is an apocalyptic number.

66665306 is a deficient number, since it is larger than the sum of its proper divisors (33332656).

66665306 is a wasteful number, since it uses less digits than its factorization.

66665306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33332655.

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 66665306 is about 8164.8824853760. The cubic root of 66665306 is about 405.4773744030.

The spelling of 66665306 in words is "sixty-six million, six hundred sixty-five thousand, three hundred six".