666545013 has 24 divisors (see below), whose sum is σ = 984024288. Its totient is φ = 434614752.

The previous prime is 666544933. The next prime is 666545017. The reversal of 666545013 is 310545666.

It is not a de Polignac number, because 666545013 - 2¹³ = 666536821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666545017) 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 23 ways as a sum of consecutive naturals, for example, 163506 + ... + 167532.

It is an arithmetic number, because the mean of its divisors is an integer number (41001012).

Almost surely, 2^666545013 is an apocalyptic number.

It is an amenable number.

666545013 is a deficient number, since it is larger than the sum of its proper divisors (317479275).

666545013 is a wasteful number, since it uses less digits than its factorization.

666545013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433 (or 4430 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 666545013 is about 25817.5330541088. The cubic root of 666545013 is about 873.5273243705.

The spelling of 666545013 in words is "six hundred sixty-six million, five hundred forty-five thousand, thirteen".