6640440226 has 16 divisors (see below), whose sum is σ = 11982749760. Its totient is φ = 2696118480.

The previous prime is 6640440181. The next prime is 6640440241. The reversal of 6640440226 is 6220440466.

It is a junction number, because it is equal to n+sod(n) for n = 6640440191 and 6640440200.

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, 12481765 + ... + 12482296.

It is an arithmetic number, because the mean of its divisors is an integer number (748921860).

Almost surely, 2^6640440226 is an apocalyptic number.

6640440226 is a deficient number, since it is larger than the sum of its proper divisors (5342309534).

6640440226 is a wasteful number, since it uses less digits than its factorization.

6640440226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24964089.

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 6640440226 is about 81488.8963356358. The cubic root of 6640440226 is about 1879.6008117665.

The spelling of 6640440226 in words is "six billion, six hundred forty million, four hundred forty thousand, two hundred twenty-six".