6662446640 has 20 divisors (see below), whose sum is σ = 15490188624. Its totient is φ = 2664978624.

The previous prime is 6662446621. The next prime is 6662446663. The reversal of 6662446640 is 466442666.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6662446591 and 6662446600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41640212 + ... + 41640371.

Almost surely, 2^6662446640 is an apocalyptic number.

It is an amenable number.

6662446640 is an abundant number, since it is smaller than the sum of its proper divisors (8827741984).

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

6662446640 is a wasteful number, since it uses less digits than its factorization.

6662446640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83280596 (or 83280590 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 44.

The square root of 6662446640 is about 81623.8117218254. The cubic root of 6662446640 is about 1881.6748542262.

The spelling of 6662446640 in words is "six billion, six hundred sixty-two million, four hundred forty-six thousand, six hundred forty".