665946960 has 320 divisors, whose sum is σ = 2567454720. Its totient is φ = 139345920.

The previous prime is 665946959. The next prime is 665946989. The reversal of 665946960 is 69649566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 989184 + ... + 989856.

It is an arithmetic number, because the mean of its divisors is an integer number (8023296).

Almost surely, 2^665946960 is an apocalyptic number.

665946960 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 665946960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1283727360).

665946960 is an abundant number, since it is smaller than the sum of its proper divisors (1901507760).

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

665946960 is a wasteful number, since it uses less digits than its factorization.

665946960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 51.

The square root of 665946960 is about 25805.9481515406. The cubic root of 665946960 is about 873.2659907024.

The spelling of 665946960 in words is "six hundred sixty-five million, nine hundred forty-six thousand, nine hundred sixty".