666676667 has 8 divisors (see below), whose sum is σ = 681268224. Its totient is φ = 652241448.

The previous prime is 666676663. The next prime is 666676697. The reversal of 666676667 is 766676666.

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

It is a cyclic number.

It is not a de Polignac number, because 666676667 - 2² = 666676663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666676663) 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, 30443 + ... + 47540.

It is an arithmetic number, because the mean of its divisors is an integer number (85158528).

Almost surely, 2^666676667 is an apocalyptic number.

666676667 is a deficient number, since it is larger than the sum of its proper divisors (14591557).

666676667 is a wasteful number, since it uses less digits than its factorization.

666676667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78169.

The product of its digits is 13716864, while the sum is 56.

The square root of 666676667 is about 25820.0826296122. The cubic root of 666676667 is about 873.5848327624.

Subtracting 666676667 from its reverse (766676666), we obtain a palindrome (99999999).

The spelling of 666676667 in words is "six hundred sixty-six million, six hundred seventy-six thousand, six hundred sixty-seven".