666662263 has 4 divisors (see below), whose sum is σ = 684680200. Its totient is φ = 648644328.

The previous prime is 666662219. The next prime is 666662287. The reversal of 666662263 is 362266666.

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 666662263 - 2²⁵ = 633107831 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 (666662363) 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, 9008913 + ... + 9008986.

It is an arithmetic number, because the mean of its divisors is an integer number (171170050).

Almost surely, 2^666662263 is an apocalyptic number.

666662263 is a deficient number, since it is larger than the sum of its proper divisors (18017937).

666662263 is a wasteful number, since it uses less digits than its factorization.

666662263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18017936.

The product of its digits is 559872, while the sum is 43.

The square root of 666662263 is about 25819.8036979370. The cubic root of 666662263 is about 873.5785412535.

The spelling of 666662263 in words is "six hundred sixty-six million, six hundred sixty-two thousand, two hundred sixty-three".