666545763 has 16 divisors (see below), whose sum is σ = 966573216. Its totient is φ = 406118400.

The previous prime is 666545749. The next prime is 666545777. The reversal of 666545763 is 367545666.

It is an interprime number because it is at equal distance from previous prime (666545749) and next prime (666545777).

It is not a de Polignac number, because 666545763 - 2⁵ = 666545731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666545723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80670 + ... + 88547.

It is an arithmetic number, because the mean of its divisors is an integer number (60410826).

Almost surely, 2^666545763 is an apocalyptic number.

666545763 is a deficient number, since it is larger than the sum of its proper divisors (300027453).

666545763 is a wasteful number, since it uses less digits than its factorization.

666545763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169334.

The product of its digits is 2721600, while the sum is 48.

The square root of 666545763 is about 25817.5475791176. The cubic root of 666545763 is about 873.5276520029.

The spelling of 666545763 in words is "six hundred sixty-six million, five hundred forty-five thousand, seven hundred sixty-three".