665232512 has 64 divisors (see below), whose sum is σ = 1536071040. Its totient is φ = 281057280.

The previous prime is 665232487. The next prime is 665232527. The reversal of 665232512 is 215232566.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58388 + ... + 68844.

It is an arithmetic number, because the mean of its divisors is an integer number (24001110).

Almost surely, 2^665232512 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 665232512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (768035520).

665232512 is an abundant number, since it is smaller than the sum of its proper divisors (870838528).

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

665232512 is a wasteful number, since it uses less digits than its factorization.

665232512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10549 (or 10537 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 665232512 is about 25792.1017367721. The cubic root of 665232512 is about 872.9535902536.

The spelling of 665232512 in words is "six hundred sixty-five million, two hundred thirty-two thousand, five hundred twelve".