666242667 has 12 divisors (see below), whose sum is σ = 962887120. Its totient is φ = 443914128.

The previous prime is 666242663. The next prime is 666242677. The reversal of 666242667 is 766242666.

It is not a de Polignac number, because 666242667 - 2² = 666242663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666242663) 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 11 ways as a sum of consecutive naturals, for example, 2788 + ... + 36609.

Almost surely, 2^666242667 is an apocalyptic number.

666242667 is a deficient number, since it is larger than the sum of its proper divisors (296644453).

666242667 is a wasteful number, since it uses less digits than its factorization.

666242667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41282 (or 41279 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The square root of 666242667 is about 25811.6769505586. The cubic root of 666242667 is about 873.3952265474.

Subtracting 666242667 from its reverse (766242666), we obtain a palindrome (99999999).

The spelling of 666242667 in words is "six hundred sixty-six million, two hundred forty-two thousand, six hundred sixty-seven".