665983580 has 48 divisors (see below), whose sum is σ = 1425138624. Its totient is φ = 261381120.

The previous prime is 665983547. The next prime is 665983583. The reversal of 665983580 is 85389566.

665983580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665983583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231350 + ... + 234210.

It is an arithmetic number, because the mean of its divisors is an integer number (29690388).

Almost surely, 2^665983580 is an apocalyptic number.

It is an amenable number.

665983580 is an abundant number, since it is smaller than the sum of its proper divisors (759155044).

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

665983580 is a wasteful number, since it uses less digits than its factorization.

665983580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086 (or 3084 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 665983580 is about 25806.6576681290. The cubic root of 665983580 is about 873.2819971896.

The spelling of 665983580 in words is "six hundred sixty-five million, nine hundred eighty-three thousand, five hundred eighty".