666594847 has 4 divisors (see below), whose sum is σ = 666659016. Its totient is φ = 666530680.

The previous prime is 666594827. The next prime is 666594853. The reversal of 666594847 is 748495666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666594847 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 (666594827) 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, 12529 + ... + 38602.

It is an arithmetic number, because the mean of its divisors is an integer number (166664754).

Almost surely, 2^666594847 is an apocalyptic number.

666594847 is a deficient number, since it is larger than the sum of its proper divisors (64169).

666594847 is a wasteful number, since it uses less digits than its factorization.

666594847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64168.

The product of its digits is 8709120, while the sum is 55.

The square root of 666594847 is about 25818.4981553924. The cubic root of 666594847 is about 873.5490934808.

The spelling of 666594847 in words is "six hundred sixty-six million, five hundred ninety-four thousand, eight hundred forty-seven".