666543164 has 12 divisors (see below), whose sum is σ = 1333086384. Its totient is φ = 285661344.

The previous prime is 666543139. The next prime is 666543169. The reversal of 666543164 is 461345666.

666543164 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666543169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11902529 + ... + 11902584.

It is an arithmetic number, because the mean of its divisors is an integer number (111090532).

Almost surely, 2^666543164 is an apocalyptic number.

It is an amenable number.

666543164 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666543164 is a wasteful number, since it uses less digits than its factorization.

666543164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23805124 (or 23805122 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 666543164 is about 25817.4972450856. The cubic root of 666543164 is about 873.5265166463.

The spelling of 666543164 in words is "six hundred sixty-six million, five hundred forty-three thousand, one hundred sixty-four".