665132240 has 40 divisors (see below), whose sum is σ = 1627827360. Its totient is φ = 252049536.

The previous prime is 665132231. The next prime is 665132267. The reversal of 665132240 is 42231566.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 217274 + ... + 220313.

It is an arithmetic number, because the mean of its divisors is an integer number (40695684).

Almost surely, 2^665132240 is an apocalyptic number.

It is an amenable number.

665132240 is an abundant number, since it is smaller than the sum of its proper divisors (962695120).

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

665132240 is a wasteful number, since it uses less digits than its factorization.

665132240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437619 (or 437613 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 665132240 is about 25790.1578126230. The cubic root of 665132240 is about 872.9097272938.

The spelling of 665132240 in words is "six hundred sixty-five million, one hundred thirty-two thousand, two hundred forty".