6640800080 has 40 divisors (see below), whose sum is σ = 15450630144. Its totient is φ = 2654467200.

The previous prime is 6640800079. The next prime is 6640800091. The reversal of 6640800080 is 800080466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 89465 + ... + 145895.

Almost surely, 2^6640800080 is an apocalyptic number.

It is an amenable number.

6640800080 is an abundant number, since it is smaller than the sum of its proper divisors (8809830064).

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

6640800080 is a wasteful number, since it uses less digits than its factorization.

6640800080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57915 (or 57909 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 6640800080 is about 81491.1042997946. The cubic root of 6640800080 is about 1879.6347638154.

The spelling of 6640800080 in words is "six billion, six hundred forty million, eight hundred thousand, eighty".