6669667578 has 64 divisors (see below), whose sum is σ = 15373071360. Its totient is φ = 1889661312.

The previous prime is 6669667561. The next prime is 6669667597. The reversal of 6669667578 is 8757669666.

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 31 ways as a sum of consecutive naturals, for example, 4223193 + ... + 4224771.

It is an arithmetic number, because the mean of its divisors is an integer number (240204240).

Almost surely, 2^6669667578 is an apocalyptic number.

6669667578 is an abundant number, since it is smaller than the sum of its proper divisors (8703403782).

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

6669667578 is a wasteful number, since it uses less digits than its factorization.

6669667578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371.

The product of its digits is 137168640, while the sum is 66.

The square root of 6669667578 is about 81668.0327790501. The cubic root of 6669667578 is about 1882.3544119687.

The spelling of 6669667578 in words is "six billion, six hundred sixty-nine million, six hundred sixty-seven thousand, five hundred seventy-eight".