669445513920 has 168 divisors, whose sum is σ = 2305868357520. Its totient is φ = 178266470400.

The previous prime is 669445513907. The next prime is 669445513987. The reversal of 669445513920 is 29315544966.

669445513920 is a `hidden beast` number, since 6 + 6 + 94 + 455 + 13 + 92 + 0 = 666.

It is a super-2 number, since 2×669445513920² (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 23 ways as a sum of consecutive naturals, for example, 1877995 + ... + 2205845.

It is an arithmetic number, because the mean of its divisors is an integer number (13725406890).

Almost surely, 2^669445513920 is an apocalyptic number.

669445513920 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 669445513920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1152934178760).

669445513920 is an abundant number, since it is smaller than the sum of its proper divisors (1636422843600).

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

669445513920 is a wasteful number, since it uses less digits than its factorization.

669445513920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328583 (or 328570 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 669445513920 in words is "six hundred sixty-nine billion, four hundred forty-five million, five hundred thirteen thousand, nine hundred twenty".