666166263 has 8 divisors (see below), whose sum is σ = 1015110528. Its totient is φ = 380666424.

The previous prime is 666166219. The next prime is 666166283. The reversal of 666166263 is 362661666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666166263 - 2⁹ = 666165751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666166213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15861081 + ... + 15861122.

It is an arithmetic number, because the mean of its divisors is an integer number (126888816).

Almost surely, 2^666166263 is an apocalyptic number.

666166263 is a deficient number, since it is larger than the sum of its proper divisors (348944265).

666166263 is a wasteful number, since it uses less digits than its factorization.

666166263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31722213.

The product of its digits is 279936, while the sum is 42.

The square root of 666166263 is about 25810.1968803029. The cubic root of 666166263 is about 873.3618385927.

The spelling of 666166263 in words is "six hundred sixty-six million, one hundred sixty-six thousand, two hundred sixty-three".