6638045906 has 16 divisors (see below), whose sum is σ = 10080559104. Its totient is φ = 3278094624.

The previous prime is 6638045881. The next prime is 6638045929. The reversal of 6638045906 is 6095408366.

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, 1955 + ... + 115238.

It is an arithmetic number, because the mean of its divisors is an integer number (630034944).

Almost surely, 2^6638045906 is an apocalyptic number.

6638045906 is a deficient number, since it is larger than the sum of its proper divisors (3442513198).

6638045906 is a wasteful number, since it uses less digits than its factorization.

6638045906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117545.

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 6638045906 is about 81474.2039298329. The cubic root of 6638045906 is about 1879.3748776083.

The spelling of 6638045906 in words is "six billion, six hundred thirty-eight million, forty-five thousand, nine hundred six".