666677671 has 16 divisors (see below), whose sum is σ = 756177408. Its totient is φ = 582436800.

The previous prime is 666677659. The next prime is 666677689. The reversal of 666677671 is 176776666.

It is not a de Polignac number, because 666677671 - 2⁹ = 666677159 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 (666677611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19186 + ... + 41248.

It is an arithmetic number, because the mean of its divisors is an integer number (47261088).

Almost surely, 2^666677671 is an apocalyptic number.

666677671 is a deficient number, since it is larger than the sum of its proper divisors (89499737).

666677671 is a wasteful number, since it uses less digits than its factorization.

666677671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22182.

The product of its digits is 2667168, while the sum is 52.

The square root of 666677671 is about 25820.1020718354. The cubic root of 666677671 is about 873.5852712952.

The spelling of 666677671 in words is "six hundred sixty-six million, six hundred seventy-seven thousand, six hundred seventy-one".