667555871 has 2 divisors, whose sum is σ = 667555872. Its totient is φ = 667555870.

The previous prime is 667555859. The next prime is 667555883. The reversal of 667555871 is 178555766.

It is a happy number.

667555871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (667555859) and next prime (667555883).

It is a cyclic number.

It is not a de Polignac number, because 667555871 - 2⁶ = 667555807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667552871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333777935 + 333777936.

It is an arithmetic number, because the mean of its divisors is an integer number (333777936).

Almost surely, 2^667555871 is an apocalyptic number.

667555871 is a deficient number, since it is larger than the sum of its proper divisors (1).

667555871 is an equidigital number, since it uses as much as digits as its factorization.

667555871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764000, while the sum is 50.

The square root of 667555871 is about 25837.1026045878. The cubic root of 667555871 is about 873.9686879499.

The spelling of 667555871 in words is "six hundred sixty-seven million, five hundred fifty-five thousand, eight hundred seventy-one".