669352159872 has 240 divisors, whose sum is σ = 2189537138250. Its totient is φ = 202833607680.

The previous prime is 669352159829. The next prime is 669352159913. The reversal of 669352159872 is 278951253966.

669352159872 is a `hidden beast` number, since 6 + 6 + 9 + 35 + 2 + 1 + 598 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 669346514496 + 5645376 = 818136^2 + 2376^2 .

It is a super-2 number, since 2×669352159872² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 987754 + ... + 1521302.

Almost surely, 2^669352159872 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 669352159872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1094768569125).

669352159872 is an abundant number, since it is smaller than the sum of its proper divisors (1520184978378).

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

669352159872 is a wasteful number, since it uses less digits than its factorization.

669352159872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533597 (or 533565 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 669352159872 in words is "six hundred sixty-nine billion, three hundred fifty-two million, one hundred fifty-nine thousand, eight hundred seventy-two".