667746556 has 6 divisors (see below), whose sum is σ = 1168556480. Its totient is φ = 333873276.

The previous prime is 667746529. The next prime is 667746559. The reversal of 667746556 is 655647766.

667746556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×667746556² = 891770926099722272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667746559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83468316 + ... + 83468323.

Almost surely, 2^667746556 is an apocalyptic number.

It is an amenable number.

667746556 is a deficient number, since it is larger than the sum of its proper divisors (500809924).

667746556 is a wasteful number, since it uses less digits than its factorization.

667746556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166936643 (or 166936641 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 52.

The square root of 667746556 is about 25840.7924801079. The cubic root of 667746556 is about 874.0518953942.

The spelling of 667746556 in words is "six hundred sixty-seven million, seven hundred forty-six thousand, five hundred fifty-six".