665876736 has 432 divisors, whose sum is σ = 2410611840. Its totient is φ = 172523520.

The previous prime is 665876719. The next prime is 665876741. The reversal of 665876736 is 637678566.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12563686 + ... + 12563738.

It is an arithmetic number, because the mean of its divisors is an integer number (5580120).

Almost surely, 2^665876736 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 665876736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1205305920).

665876736 is an abundant number, since it is smaller than the sum of its proper divisors (1744735104).

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

665876736 is a wasteful number, since it uses less digits than its factorization.

665876736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 125 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The square root of 665876736 is about 25804.5874991250. The cubic root of 665876736 is about 873.2352943706.

The spelling of 665876736 in words is "six hundred sixty-five million, eight hundred seventy-six thousand, seven hundred thirty-six".