665543260 has 48 divisors (see below), whose sum is σ = 1434718656. Its totient is φ = 259231232.

The previous prime is 665543257. The next prime is 665543261. The reversal of 665543260 is 62345566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665543261) 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, 142929 + ... + 147511.

It is an arithmetic number, because the mean of its divisors is an integer number (29889972).

Almost surely, 2^665543260 is an apocalyptic number.

It is an amenable number.

665543260 is an abundant number, since it is smaller than the sum of its proper divisors (769175396).

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

665543260 is a wasteful number, since it uses less digits than its factorization.

665543260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782 (or 4780 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 665543260 is about 25798.1251256753. The cubic root of 665543260 is about 873.0894957951.

The spelling of 665543260 in words is "six hundred sixty-five million, five hundred forty-three thousand, two hundred sixty".