666438327 has 8 divisors (see below), whose sum is σ = 987316080. Its totient is φ = 444292200.

The previous prime is 666438323. The next prime is 666438343. The reversal of 666438327 is 723834666.

It is not a de Polignac number, because 666438327 - 2² = 666438323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666438323) 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, 12341424 + ... + 12341477.

It is an arithmetic number, because the mean of its divisors is an integer number (123414510).

Almost surely, 2^666438327 is an apocalyptic number.

666438327 is a deficient number, since it is larger than the sum of its proper divisors (320877753).

666438327 is a wasteful number, since it uses less digits than its factorization.

666438327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24682910 (or 24682904 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The square root of 666438327 is about 25815.4668173946. The cubic root of 666438327 is about 873.4807168112.

The spelling of 666438327 in words is "six hundred sixty-six million, four hundred thirty-eight thousand, three hundred twenty-seven".