665613760 has 112 divisors (see below), whose sum is σ = 1823533056. Its totient is φ = 226685952.

The previous prime is 665613677. The next prime is 665613779. The reversal of 665613760 is 67316566.

665613760 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364209 + ... + 366031.

Almost surely, 2^665613760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665613760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911766528).

665613760 is an abundant number, since it is smaller than the sum of its proper divisors (1157919296).

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

665613760 is a wasteful number, since it uses less digits than its factorization.

665613760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010 (or 2000 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 665613760 is about 25799.4914678565. The cubic root of 665613760 is about 873.1203230605.

The spelling of 665613760 in words is "six hundred sixty-five million, six hundred thirteen thousand, seven hundred sixty".