666564003 has 36 divisors (see below), whose sum is σ = 1121903640. Its totient is φ = 380249856.

The previous prime is 666563971. The next prime is 666564007. The reversal of 666564003 is 300465666.

It is not a de Polignac number, because 666564003 - 2⁵ = 666563971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666564007) by changing a digit.

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 in 35 ways as a sum of consecutive naturals, for example, 408876 + ... + 410502.

It is an arithmetic number, because the mean of its divisors is an integer number (31163990).

Almost surely, 2^666564003 is an apocalyptic number.

666564003 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

666564003 is a deficient number, since it is larger than the sum of its proper divisors (455339637).

666564003 is a wasteful number, since it uses less digits than its factorization.

666564003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576 (or 2566 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 666564003 is about 25817.9008248153. The cubic root of 666564003 is about 873.5356199474.

The spelling of 666564003 in words is "six hundred sixty-six million, five hundred sixty-four thousand, three".