6669378544 has 20 divisors (see below), whose sum is σ = 13047379696. Its totient is φ = 3302312832.

The previous prime is 6669378497. The next prime is 6669378577. The reversal of 6669378544 is 4458739666.

It is a happy number.

It is a super-2 number, since 2×6669378544² = 88961220326335119872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021829 + ... + 2025124.

Almost surely, 2^6669378544 is an apocalyptic number.

It is an amenable number.

6669378544 is a deficient number, since it is larger than the sum of its proper divisors (6378001152).

6669378544 is a wasteful number, since it uses less digits than its factorization.

6669378544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4047064 (or 4047058 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 58.

The square root of 6669378544 is about 81666.2631935611. The cubic root of 6669378544 is about 1882.3272205943.

The spelling of 6669378544 in words is "six billion, six hundred sixty-nine million, three hundred seventy-eight thousand, five hundred forty-four".