669523205120 has 1056 divisors, whose sum is σ = 2145250759680. Its totient is φ = 198057000960.

The previous prime is 669523205107. The next prime is 669523205123. The reversal of 669523205120 is 21502325966.

It is a super-2 number, since 2×669523205120² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669523205123) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 8066544599 + ... + 8066544681.

Almost surely, 2^669523205120 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 669523205120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072625379840).

669523205120 is an abundant number, since it is smaller than the sum of its proper divisors (1475727554560).

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

669523205120 is a wasteful number, since it uses less digits than its factorization.

669523205120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 669523205120 in words is "six hundred sixty-nine billion, five hundred twenty-three million, two hundred five thousand, one hundred twenty".