666677 has 4 divisors (see below), whose sum is σ = 727296. Its totient is φ = 606060.

The previous prime is 666671. The next prime is 666683. The reversal of 666677 is 776666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (666671) and next prime (666683).

It is a cyclic number.

It is not a de Polignac number, because 666677 - 2¹⁸ = 404533 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a nialpdrome in base 7.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 666677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666671) 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, 30293 + ... + 30314.

It is an arithmetic number, because the mean of its divisors is an integer number (181824).

2⁶⁶⁶⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

666677 is a deficient number, since it is larger than the sum of its proper divisors (60619).

666677 is a wasteful number, since it uses less digits than its factorization.

666677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60618.

The product of its digits is 63504, while the sum is 38.

The square root of 666677 is about 816.5029087517. The cubic root of 666677 is about 87.3584978212.

The spelling of 666677 in words is "six hundred sixty-six thousand, six hundred seventy-seven".