666971627 has 8 divisors (see below), whose sum is σ = 765613056. Its totient is φ = 569170152.

The previous prime is 666971567. The next prime is 666971629. The reversal of 666971627 is 726179666.

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 666971627 - 2⁶ = 666971563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666971629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208283 + ... + 211460.

It is an arithmetic number, because the mean of its divisors is an integer number (95701632).

Almost surely, 2^666971627 is an apocalyptic number.

666971627 is a deficient number, since it is larger than the sum of its proper divisors (98641429).

666971627 is a wasteful number, since it uses less digits than its factorization.

666971627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419977.

The product of its digits is 1143072, while the sum is 50.

The square root of 666971627 is about 25825.7938309745. The cubic root of 666971627 is about 873.7136481254.

The spelling of 666971627 in words is "six hundred sixty-six million, nine hundred seventy-one thousand, six hundred twenty-seven".