665432225424 has 240 divisors, whose sum is σ = 2003818497408. Its totient is φ = 205651150848.

The previous prime is 665432225399. The next prime is 665432225431. The reversal of 665432225424 is 424522234566.

665432225424 is a `hidden beast` number, since 6 + 6 + 54 + 32 + 22 + 542 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 665432225424.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14546652 + ... + 14592324.

Almost surely, 2^665432225424 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 665432225424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1001909248704).

665432225424 is an abundant number, since it is smaller than the sum of its proper divisors (1338386271984).

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

665432225424 is a wasteful number, since it uses less digits than its factorization.

665432225424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45846 (or 45837 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 45.

The spelling of 665432225424 in words is "six hundred sixty-five billion, four hundred thirty-two million, two hundred twenty-five thousand, four hundred twenty-four".