6640445416 has 32 divisors (see below), whose sum is σ = 13589470080. Its totient is φ = 3016886400.

The previous prime is 6640445411. The next prime is 6640445417. The reversal of 6640445416 is 6145440466.

It is not an unprimeable number, because it can be changed into a prime (6640445411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170401 + ... + 205711.

It is an arithmetic number, because the mean of its divisors is an integer number (424670940).

Almost surely, 2^6640445416 is an apocalyptic number.

It is an amenable number.

6640445416 is an abundant number, since it is smaller than the sum of its proper divisors (6949024664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6640445416 is a wasteful number, since it uses less digits than its factorization.

6640445416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37465 (or 37461 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The square root of 6640445416 is about 81488.9281804590. The cubic root of 6640445416 is about 1879.6013014492.

The spelling of 6640445416 in words is "six billion, six hundred forty million, four hundred forty-five thousand, four hundred sixteen".