667381558 has 4 divisors (see below), whose sum is σ = 1001072340. Its totient is φ = 333690778.

The previous prime is 667381531. The next prime is 667381591. The reversal of 667381558 is 855183766.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166845388 + ... + 166845391.

It is an arithmetic number, because the mean of its divisors is an integer number (250268085).

Almost surely, 2^667381558 is an apocalyptic number.

667381558 is a deficient number, since it is larger than the sum of its proper divisors (333690782).

667381558 is a wasteful number, since it uses less digits than its factorization.

667381558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333690781.

The product of its digits is 1209600, while the sum is 49.

The square root of 667381558 is about 25833.7290765387. The cubic root of 667381558 is about 873.8926107392.

The spelling of 667381558 in words is "six hundred sixty-seven million, three hundred eighty-one thousand, five hundred fifty-eight".