665226240 has 352 divisors, whose sum is σ = 2546795520. Its totient is φ = 144900096.

The previous prime is 665226229. The next prime is 665226259. The reversal of 665226240 is 42622566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2472826 + ... + 2473094.

Almost surely, 2^665226240 is an apocalyptic number.

665226240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665226240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273397760).

665226240 is an abundant number, since it is smaller than the sum of its proper divisors (1881569280).

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

665226240 is a wasteful number, since it uses less digits than its factorization.

665226240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 665226240 is about 25791.9801488757. The cubic root of 665226240 is about 872.9508467606.

The spelling of 665226240 in words is "six hundred sixty-five million, two hundred twenty-six thousand, two hundred forty".