669294269280 has 1728 divisors, whose sum is σ = 3014912819520. Its totient is φ = 138156834816.

The previous prime is 669294269263. The next prime is 669294269309. The reversal of 669294269280 is 82962492966.

669294269280 is a `hidden beast` number, since 6 + 6 + 9 + 2 + 94 + 269 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 1896017584 + ... + 1896017936.

It is an arithmetic number, because the mean of its divisors is an integer number (1744741215).

Almost surely, 2^669294269280 is an apocalyptic number.

669294269280 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 669294269280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1507456409760).

669294269280 is an abundant number, since it is smaller than the sum of its proper divisors (2345618550240).

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

669294269280 is a wasteful number, since it uses less digits than its factorization.

669294269280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 63.

The spelling of 669294269280 in words is "six hundred sixty-nine billion, two hundred ninety-four million, two hundred sixty-nine thousand, two hundred eighty".