667255657 has 8 divisors (see below), whose sum is σ = 677140992. Its totient is φ = 657384000.

The previous prime is 667255649. The next prime is 667255679. The reversal of 667255657 is 756552766.

667255657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 667255657 - 2³ = 667255649 is a prime.

It is a super-2 number, since 2×667255657² = 890460223597003298, which contains 22 as substring.

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 667255657.

It is not an unprimeable number, because it can be changed into a prime (667255157) 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, 136113 + ... + 140929.

It is an arithmetic number, because the mean of its divisors is an integer number (84642624).

Almost surely, 2^667255657 is an apocalyptic number.

It is an amenable number.

667255657 is a deficient number, since it is larger than the sum of its proper divisors (9885335).

667255657 is a wasteful number, since it uses less digits than its factorization.

667255657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839.

The product of its digits is 2646000, while the sum is 49.

The square root of 667255657 is about 25831.2922053853. The cubic root of 667255657 is about 873.8376542347.

The spelling of 667255657 in words is "six hundred sixty-seven million, two hundred fifty-five thousand, six hundred fifty-seven".