666595494 has 20 divisors (see below), whose sum is σ = 1493668044. Its totient is φ = 222198444.

The previous prime is 666595477. The next prime is 666595513. The reversal of 666595494 is 494595666.

It is a super-2 number, since 2×666595494² = 888699105242208072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 666595494.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2057232 + ... + 2057555.

Almost surely, 2^666595494 is an apocalyptic number.

666595494 is an abundant number, since it is smaller than the sum of its proper divisors (827072550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666595494 is a wasteful number, since it uses less digits than its factorization.

666595494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114801 (or 4114792 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The square root of 666595494 is about 25818.5106851654. The cubic root of 666595494 is about 873.5493761043.

The spelling of 666595494 in words is "six hundred sixty-six million, five hundred ninety-five thousand, four hundred ninety-four".