665308560 has 240 divisors, whose sum is σ = 2489947776. Its totient is φ = 143935488.

The previous prime is 665308529. The next prime is 665308561. The reversal of 665308560 is 65803566.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665308561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 605932 + ... + 607028.

Almost surely, 2^665308560 is an apocalyptic number.

665308560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665308560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1244973888).

665308560 is an abundant number, since it is smaller than the sum of its proper divisors (1824639216).

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

665308560 is a wasteful number, since it uses less digits than its factorization.

665308560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 665308560 is about 25793.5759444091. The cubic root of 665308560 is about 872.9868537336.

The spelling of 665308560 in words is "six hundred sixty-five million, three hundred eight thousand, five hundred sixty".