669188520 has 512 divisors, whose sum is σ = 2999808000. Its totient is φ = 128148480.

The previous prime is 669188497. The next prime is 669188557. The reversal of 669188520 is 25881966.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1080771 + ... + 1081389.

It is an arithmetic number, because the mean of its divisors is an integer number (5859000).

Almost surely, 2^669188520 is an apocalyptic number.

669188520 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 669188520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1499904000).

669188520 is an abundant number, since it is smaller than the sum of its proper divisors (2330619480).

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

669188520 is a wasteful number, since it uses less digits than its factorization.

669188520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 669188520 is about 25868.6783581999. The cubic root of 669188520 is about 874.6805996143.

The spelling of 669188520 in words is "six hundred sixty-nine million, one hundred eighty-eight thousand, five hundred twenty".