669163520 has 168 divisors, whose sum is σ = 1756978452. Its totient is φ = 243793920.

The previous prime is 669163519. The next prime is 669163553. The reversal of 669163520 is 25361966.

It can be written as a sum of positive squares in 2 ways, for example, as 665227264 + 3936256 = 25792^2 + 1984^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21585905 + ... + 21585935.

Almost surely, 2^669163520 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 669163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (878489226).

669163520 is an abundant number, since it is smaller than the sum of its proper divisors (1087814932).

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

669163520 is an equidigital number, since it uses as much as digits as its factorization.

669163520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 669163520 is about 25868.1951438441. The cubic root of 669163520 is about 874.6697071743.

The spelling of 669163520 in words is "six hundred sixty-nine million, one hundred sixty-three thousand, five hundred twenty".