6669699570 has 80 divisors (see below), whose sum is σ = 18093038040. Its totient is φ = 1762822656.

The previous prime is 6669699541. The next prime is 6669699581. The reversal of 6669699570 is 759969666.

It can be written as a sum of positive squares in 4 ways, for example, as 4289333049 + 2380366521 = 65493^2 + 48789^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6669699498 and 6669699507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 55096 + ... + 127964.

Almost surely, 2^6669699570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6669699570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9046519020).

6669699570 is an abundant number, since it is smaller than the sum of its proper divisors (11423338470).

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

6669699570 is a wasteful number, since it uses less digits than its factorization.

6669699570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73001 (or 72992 counting only the distinct ones).

The product of its (nonzero) digits is 33067440, while the sum is 63.

The square root of 6669699570 is about 81668.2286449265. The cubic root of 6669699570 is about 1882.3574216233.

The spelling of 6669699570 in words is "six billion, six hundred sixty-nine million, six hundred ninety-nine thousand, five hundred seventy".