667181677 has 12 divisors (see below), whose sum is σ = 738487260. Its totient is φ = 600626048.

The previous prime is 667181663. The next prime is 667181681. The reversal of 667181677 is 776181766.

667181677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 375933321 + 291248356 = 19389^2 + 17066^2 .

It is not a de Polignac number, because 667181677 - 2¹¹ = 667179629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667181677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667181477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28102 + ... + 46087.

It is an arithmetic number, because the mean of its divisors is an integer number (61540605).

Almost surely, 2^667181677 is an apocalyptic number.

It is an amenable number.

667181677 is a deficient number, since it is larger than the sum of its proper divisors (71305583).

667181677 is a wasteful number, since it uses less digits than its factorization.

667181677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74252 (or 74229 counting only the distinct ones).

The product of its digits is 592704, while the sum is 49.

The square root of 667181677 is about 25829.8601815805. The cubic root of 667181677 is about 873.8053583181.

The spelling of 667181677 in words is "six hundred sixty-seven million, one hundred eighty-one thousand, six hundred seventy-seven".