6640831538 has 32 divisors (see below), whose sum is σ = 11356716672. Its totient is φ = 2882880000.

The previous prime is 6640831523. The next prime is 6640831543. The reversal of 6640831538 is 8351380466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330788 + ... + 350288.

It is an arithmetic number, because the mean of its divisors is an integer number (354897396).

Almost surely, 2^6640831538 is an apocalyptic number.

6640831538 is a deficient number, since it is larger than the sum of its proper divisors (4715885134).

6640831538 is a wasteful number, since it uses less digits than its factorization.

6640831538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20210.

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 6640831538 is about 81491.2973144986. The cubic root of 6640831538 is about 1879.6377318040.

The spelling of 6640831538 in words is "six billion, six hundred forty million, eight hundred thirty-one thousand, five hundred thirty-eight".