66669307 has 4 divisors (see below), whose sum is σ = 68219800. Its totient is φ = 65118816.

The previous prime is 66669293. The next prime is 66669319. The reversal of 66669307 is 70396666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70396666 = 2 ⋅35198333.

It is a cyclic number.

It is not a de Polignac number, because 66669307 - 2²³ = 58280699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1550449 = 66669307 / (6 + 6 + 6 + 6 + 9 + 3 + 0 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66664307) 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, 775182 + ... + 775267.

It is an arithmetic number, because the mean of its divisors is an integer number (17054950).

Almost surely, 2^66669307 is an apocalyptic number.

66669307 is a deficient number, since it is larger than the sum of its proper divisors (1550493).

66669307 is a wasteful number, since it uses less digits than its factorization.

66669307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550492.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 66669307 is about 8165.1274944118. The cubic root of 66669307 is about 405.4854859811.

The spelling of 66669307 in words is "sixty-six million, six hundred sixty-nine thousand, three hundred seven".