669698668800 has 1296 divisors, whose sum is σ = 2860735567872. Its totient is φ = 151837286400.

The previous prime is 669698668699. The next prime is 669698668801. The reversal of 669698668800 is 8866896966.

It is a tau number, because it is divible by the number of its divisors (1296).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (669698668801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2471212665 + ... + 2471212935.

Almost surely, 2^669698668800 is an apocalyptic number.

669698668800 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 669698668800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1430367783936).

669698668800 is an abundant number, since it is smaller than the sum of its proper divisors (2191036899072).

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

669698668800 is a wasteful number, since it uses less digits than its factorization.

669698668800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 322486272, while the sum is 72.

The spelling of 669698668800 in words is "six hundred sixty-nine billion, six hundred ninety-eight million, six hundred sixty-eight thousand, eight hundred".