666829263 has 16 divisors (see below), whose sum is σ = 937345280. Its totient is φ = 420505344.

The previous prime is 666829259. The next prime is 666829297. The reversal of 666829263 is 362928666.

It is not a de Polignac number, because 666829263 - 2² = 666829259 is a prime.

It is a super-2 number, since 2×666829263² = 889322531986246338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666829213) 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, 29670 + ... + 47052.

It is an arithmetic number, because the mean of its divisors is an integer number (58584080).

Almost surely, 2^666829263 is an apocalyptic number.

666829263 is a deficient number, since it is larger than the sum of its proper divisors (270516017).

666829263 is a wasteful number, since it uses less digits than its factorization.

666829263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18078.

The product of its digits is 1119744, while the sum is 48.

The square root of 666829263 is about 25823.0374472098. The cubic root of 666829263 is about 873.6514794535.

The spelling of 666829263 in words is "six hundred sixty-six million, eight hundred twenty-nine thousand, two hundred sixty-three".