669562519824 has 135 divisors (see below), whose sum is σ = 2060013299799. Its totient is φ = 202865002560.

The previous prime is 669562519819. The next prime is 669562519883. The reversal of 669562519824 is 428915265966.

It is a happy number.

The square root of 669562519824 is 818268.

It is a perfect power (a square), and thus also a powerful number.

669562519824 is a `hidden beast` number, since 6 + 6 + 95 + 6 + 2 + 519 + 8 + 24 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 108008277 + ... + 108014475.

Almost surely, 2^669562519824 is an apocalyptic number.

669562519824 is the 818268-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669562519824

669562519824 is an abundant number, since it is smaller than the sum of its proper divisors (1390450779975).

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

669562519824 is an equidigital number, since it uses as much as digits as its factorization.

669562519824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12434 (or 6215 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 63.

The spelling of 669562519824 in words is "six hundred sixty-nine billion, five hundred sixty-two million, five hundred nineteen thousand, eight hundred twenty-four".