666795213 has 64 divisors (see below), whose sum is σ = 1182105600. Its totient is φ = 363450240.

The previous prime is 666795203. The next prime is 666795223. The reversal of 666795213 is 312597666.

It is an interprime number because it is at equal distance from previous prime (666795203) and next prime (666795223).

It is not a de Polignac number, because 666795213 - 2⁹ = 666794701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666795203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 426928 + ... + 428486.

It is an arithmetic number, because the mean of its divisors is an integer number (18470400).

Almost surely, 2^666795213 is an apocalyptic number.

666795213 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

666795213 is a deficient number, since it is larger than the sum of its proper divisors (515310387).

666795213 is a wasteful number, since it uses less digits than its factorization.

666795213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679 (or 1673 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 666795213 is about 25822.3781437729. The cubic root of 666795213 is about 873.6366089107.

The spelling of 666795213 in words is "six hundred sixty-six million, seven hundred ninety-five thousand, two hundred thirteen".