666106667 has 4 divisors (see below), whose sum is σ = 666775776. Its totient is φ = 665437560.

The previous prime is 666106619. The next prime is 666106669. The reversal of 666106667 is 766601666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666106667 - 2¹² = 666102571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666106669) 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, 333059 + ... + 335052.

It is an arithmetic number, because the mean of its divisors is an integer number (166693944).

Almost surely, 2^666106667 is an apocalyptic number.

666106667 is a deficient number, since it is larger than the sum of its proper divisors (669109).

666106667 is an equidigital number, since it uses as much as digits as its factorization.

666106667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669108.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 666106667 is about 25809.0423495332. The cubic root of 666106667 is about 873.3357938312.

The spelling of 666106667 in words is "six hundred sixty-six million, one hundred six thousand, six hundred sixty-seven".