666658677 has 8 divisors (see below), whose sum is σ = 891118816. Its totient is φ = 443318832.

The previous prime is 666658673. The next prime is 666658679. The reversal of 666658677 is 776856666.

It is a happy number.

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

It is not a de Polignac number, because 666658677 - 2² = 666658673 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 (666658673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278683 + ... + 281064.

It is an arithmetic number, because the mean of its divisors is an integer number (111389852).

Almost surely, 2^666658677 is an apocalyptic number.

It is an amenable number.

666658677 is a deficient number, since it is larger than the sum of its proper divisors (224460139).

666658677 is a wasteful number, since it uses less digits than its factorization.

666658677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560147.

The product of its digits is 15240960, while the sum is 57.

The square root of 666658677 is about 25819.7342550228. The cubic root of 666658677 is about 873.5769749140.

The spelling of 666658677 in words is "six hundred sixty-six million, six hundred fifty-eight thousand, six hundred seventy-seven".