665671446 has 40 divisors (see below), whose sum is σ = 1627201224. Its totient is φ = 201718080.

The previous prime is 665671439. The next prime is 665671529. The reversal of 665671446 is 644176566.

It is a Curzon number.

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 19 ways as a sum of consecutive naturals, for example, 184995 + ... + 188558.

Almost surely, 2^665671446 is an apocalyptic number.

665671446 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

665671446 is an abundant number, since it is smaller than the sum of its proper divisors (961529778).

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

665671446 is a wasteful number, since it uses less digits than its factorization.

665671446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373578 (or 373569 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 665671446 is about 25800.6094114073. The cubic root of 665671446 is about 873.1455455779.

The spelling of 665671446 in words is "six hundred sixty-five million, six hundred seventy-one thousand, four hundred forty-six".