665840232 has 48 divisors (see below), whose sum is σ = 1865506500. Its totient is φ = 214292736.

The previous prime is 665840213. The next prime is 665840233. The reversal of 665840232 is 232048566.

It can be written as a sum of positive squares in 2 ways, for example, as 665330436 + 509796 = 25794^2 + 714^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (665840233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157357 + ... + 161532.

Almost surely, 2^665840232 is an apocalyptic number.

It is an amenable number.

665840232 is an abundant number, since it is smaller than the sum of its proper divisors (1199666268).

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

665840232 is a wasteful number, since it uses less digits than its factorization.

665840232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318930 (or 318923 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 665840232 is about 25803.8801733383. The cubic root of 665840232 is about 873.2193368808.

Adding to 665840232 its reverse (232048566), we get a palindrome (897888798).

The spelling of 665840232 in words is "six hundred sixty-five million, eight hundred forty thousand, two hundred thirty-two".