666455563 has 16 divisors (see below), whose sum is σ = 687283200. Its totient is φ = 646027200.

The previous prime is 666455519. The next prime is 666455593. The reversal of 666455563 is 365554666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666455563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666455593) 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, 2129095 + ... + 2129407.

It is an arithmetic number, because the mean of its divisors is an integer number (42955200).

Almost surely, 2^666455563 is an apocalyptic number.

666455563 is a deficient number, since it is larger than the sum of its proper divisors (20827637).

666455563 is a wasteful number, since it uses less digits than its factorization.

666455563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762.

The product of its digits is 1944000, while the sum is 46.

The square root of 666455563 is about 25815.8006461159. The cubic root of 666455563 is about 873.4882469822.

The spelling of 666455563 in words is "six hundred sixty-six million, four hundred fifty-five thousand, five hundred sixty-three".