669298910720 has 640 divisors, whose sum is σ = 1958801771520. Its totient is φ = 216326471680.

The previous prime is 669298910719. The next prime is 669298910723. The reversal of 669298910720 is 27019892966.

It is a tau number, because it is divible by the number of its divisors (640).

It is a super-2 number, since 2×669298910720² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 669298910720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669298910723) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 979939499 + ... + 979940181.

It is an arithmetic number, because the mean of its divisors is an integer number (3060627768).

Almost surely, 2^669298910720 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 669298910720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979400885760).

669298910720 is an abundant number, since it is smaller than the sum of its proper divisors (1289502860800).

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

669298910720 is a wasteful number, since it uses less digits than its factorization.

669298910720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 59.

The spelling of 669298910720 in words is "six hundred sixty-nine billion, two hundred ninety-eight million, nine hundred ten thousand, seven hundred twenty".