6671991578 has 16 divisors (see below), whose sum is σ = 11470109760. Its totient is φ = 2851322496.

The previous prime is 6671991511. The next prime is 6671991617. The reversal of 6671991578 is 8751991766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670088 + ... + 679971.

It is an arithmetic number, because the mean of its divisors is an integer number (716881860).

Almost surely, 2^6671991578 is an apocalyptic number.

6671991578 is a deficient number, since it is larger than the sum of its proper divisors (4798118182).

6671991578 is a wasteful number, since it uses less digits than its factorization.

6671991578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350421.

The product of its digits is 5715360, while the sum is 59.

The square root of 6671991578 is about 81682.2598732430. The cubic root of 6671991578 is about 1882.5730177489.

The spelling of 6671991578 in words is "six billion, six hundred seventy-one million, nine hundred ninety-one thousand, five hundred seventy-eight".