66666207 has 8 divisors (see below), whose sum is σ = 89528320. Its totient is φ = 44124120.

The previous prime is 66666199. The next prime is 66666227. The reversal of 66666207 is 70266666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66666207 - 2³ = 66666199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79519 + ... + 80352.

It is an arithmetic number, because the mean of its divisors is an integer number (11191040).

Almost surely, 2^66666207 is an apocalyptic number.

66666207 is a deficient number, since it is larger than the sum of its proper divisors (22862113).

66666207 is a wasteful number, since it uses less digits than its factorization.

66666207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160013.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 66666207 is about 8164.9376605091. The cubic root of 66666207 is about 405.4792011076.

The spelling of 66666207 in words is "sixty-six million, six hundred sixty-six thousand, two hundred seven".