665314560 has 504 divisors, whose sum is σ = 2573673984. Its totient is φ = 164229120.

The previous prime is 665314513. The next prime is 665314631. The reversal of 665314560 is 65413566.

665314560 is a `hidden beast` number, since 6 + 65 + 31 + 4 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 21461745 + ... + 21461775.

It is an arithmetic number, because the mean of its divisors is an integer number (5106496).

Almost surely, 2^665314560 is an apocalyptic number.

665314560 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 665314560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1286836992).

665314560 is an abundant number, since it is smaller than the sum of its proper divisors (1908359424).

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

665314560 is an equidigital number, since it uses as much as digits as its factorization.

665314560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 665314560 is about 25793.6922521767. The cubic root of 665314560 is about 872.9894780324.

The spelling of 665314560 in words is "six hundred sixty-five million, three hundred fourteen thousand, five hundred sixty".