665061560 has 64 divisors (see below), whose sum is σ = 1643673600. Its totient is φ = 241059456.

The previous prime is 665061493. The next prime is 665061581. The reversal of 665061560 is 65160566.

It is a self number, because there is not a number n which added to its sum of digits gives 665061560.

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, 1544 + ... + 36503.

It is an arithmetic number, because the mean of its divisors is an integer number (25682400).

Almost surely, 2^665061560 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 665061560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821836800).

665061560 is an abundant number, since it is smaller than the sum of its proper divisors (978612040).

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

665061560 is a wasteful number, since it uses less digits than its factorization.

665061560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38100 (or 38096 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 665061560 is about 25788.7874860374. The cubic root of 665061560 is about 872.8788064025.

The spelling of 665061560 in words is "six hundred sixty-five million, sixty-one thousand, five hundred sixty".