666755263 has 4 divisors (see below), whose sum is σ = 668612880. Its totient is φ = 664897648.

The previous prime is 666755251. The next prime is 666755267. The reversal of 666755263 is 362557666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666755263 - 2¹³ = 666747071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666755267) 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, 928270 + ... + 928987.

It is an arithmetic number, because the mean of its divisors is an integer number (167153220).

Almost surely, 2^666755263 is an apocalyptic number.

666755263 is a deficient number, since it is larger than the sum of its proper divisors (1857617).

666755263 is a wasteful number, since it uses less digits than its factorization.

666755263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857616.

The product of its digits is 1360800, while the sum is 46.

The square root of 666755263 is about 25821.6045783371. The cubic root of 666755263 is about 873.6191610352.

The spelling of 666755263 in words is "six hundred sixty-six million, seven hundred fifty-five thousand, two hundred sixty-three".