665316432 has 120 divisors (see below), whose sum is σ = 2061876960. Its totient is φ = 198570240.

The previous prime is 665316427. The next prime is 665316461. The reversal of 665316432 is 234613566.

665316432 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 1 + 643 + 2 = 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 23 ways as a sum of consecutive naturals, for example, 102994 + ... + 109262.

It is an arithmetic number, because the mean of its divisors is an integer number (17182308).

Almost surely, 2^665316432 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 665316432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030938480).

665316432 is an abundant number, since it is smaller than the sum of its proper divisors (1396560528).

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

665316432 is a wasteful number, since it uses less digits than its factorization.

665316432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6361 (or 6352 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 665316432 is about 25793.7285400928. The cubic root of 665316432 is about 872.9902968104.

Adding to 665316432 its reverse (234613566), we get a palindrome (899929998).

The spelling of 665316432 in words is "six hundred sixty-five million, three hundred sixteen thousand, four hundred thirty-two".