66665333 has 6 divisors (see below), whose sum is σ = 77549526. Its totient is φ = 57141672.

The previous prime is 66665329. The next prime is 66665341. The reversal of 66665333 is 33356666.

It can be written as a sum of positive squares in only one way, i.e., 66618244 + 47089 = 8162^2 + 217^2 .

It is not a de Polignac number, because 66665333 - 2² = 66665329 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 680210 + ... + 680307.

It is an arithmetic number, because the mean of its divisors is an integer number (12924921).

Almost surely, 2^66665333 is an apocalyptic number.

It is an amenable number.

66665333 is a deficient number, since it is larger than the sum of its proper divisors (10884193).

66665333 is a wasteful number, since it uses less digits than its factorization.

66665333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360531 (or 1360524 counting only the distinct ones).

The product of its digits is 174960, while the sum is 38.

The square root of 66665333 is about 8164.8841387983. The cubic root of 66665333 is about 405.4774291435.

The spelling of 66665333 in words is "sixty-six million, six hundred sixty-five thousand, three hundred thirty-three".