665651224512 has 280 divisors, whose sum is σ = 1994974674000. Its totient is φ = 219442950144.

The previous prime is 665651224507. The next prime is 665651224531. The reversal of 665651224512 is 215422156566.

665651224512 is a `hidden beast` number, since 6 + 6 + 5 + 6 + 5 + 122 + 4 + 512 = 666.

It is a super-3 number, since 3×665651224512³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 592743183 + ... + 592744305.

It is an arithmetic number, because the mean of its divisors is an integer number (7124909550).

Almost surely, 2^665651224512 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 665651224512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (997487337000).

665651224512 is an abundant number, since it is smaller than the sum of its proper divisors (1329323449488).

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

665651224512 is a wasteful number, since it uses less digits than its factorization.

665651224512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305 (or 2286 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 665651224512 in words is "six hundred sixty-five billion, six hundred fifty-one million, two hundred twenty-four thousand, five hundred twelve".