666707229 has 6 divisors (see below), whose sum is σ = 963021566. Its totient is φ = 444471480.

The previous prime is 666707221. The next prime is 666707269. The reversal of 666707229 is 922707666.

It can be written as a sum of positive squares in only one way, i.e., 524501604 + 142205625 = 22902^2 + 11925^2 .

It is not a de Polignac number, because 666707229 - 2³ = 666707221 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 (666707221) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 37039282 + ... + 37039299.

Almost surely, 2^666707229 is an apocalyptic number.

It is an amenable number.

666707229 is a deficient number, since it is larger than the sum of its proper divisors (296314337).

666707229 is a wasteful number, since it uses less digits than its factorization.

666707229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74078587 (or 74078584 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 666707229 is about 25820.6744489760. The cubic root of 666707229 is about 873.5981816080.

The spelling of 666707229 in words is "six hundred sixty-six million, seven hundred seven thousand, two hundred twenty-nine".