66665307 has 8 divisors (see below), whose sum is σ = 88968784. Its totient is φ = 44402688.

The previous prime is 66665273. The next prime is 66665311. The reversal of 66665307 is 70356666.

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

It is not a de Polignac number, because 66665307 - 2⁸ = 66665051 is a prime.

It is a super-3 number, since 3×66665307³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66665327) 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, 6178 + ... + 13095.

It is an arithmetic number, because the mean of its divisors is an integer number (11121098).

Almost surely, 2^66665307 is an apocalyptic number.

66665307 is a deficient number, since it is larger than the sum of its proper divisors (22303477).

66665307 is a wasteful number, since it uses less digits than its factorization.

66665307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20429.

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 66665307 is about 8164.8825466139. The cubic root of 66665307 is about 405.4773764304.

The spelling of 66665307 in words is "sixty-six million, six hundred sixty-five thousand, three hundred seven".