667766677 has 8 divisors (see below), whose sum is σ = 670269600. Its totient is φ = 665269584.

The previous prime is 667766669. The next prime is 667766699. The reversal of 667766677 is 776667766.

It is a happy number.

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 667766677 - 2³ = 667766669 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665766677) 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, 407103 + ... + 408739.

It is an arithmetic number, because the mean of its divisors is an integer number (83783700).

Almost surely, 2^667766677 is an apocalyptic number.

It is an amenable number.

667766677 is a deficient number, since it is larger than the sum of its proper divisors (2502923).

667766677 is a wasteful number, since it uses less digits than its factorization.

667766677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915.

The product of its digits is 18670176, while the sum is 58.

The square root of 667766677 is about 25841.1818034702. The cubic root of 667766677 is about 874.0606744843.

The spelling of 667766677 in words is "six hundred sixty-seven million, seven hundred sixty-six thousand, six hundred seventy-seven".