6480643866 has 8 divisors (see below), whose sum is σ = 12961287744. Its totient is φ = 2160214620.

The previous prime is 6480643849. The next prime is 6480643867. The reversal of 6480643866 is 6683460846.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

6480643866 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (6480643867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540053650 + ... + 540053661.

It is an arithmetic number, because the mean of its divisors is an integer number (1620160968).

Almost surely, 2^6480643866 is an apocalyptic number.

6480643866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6480643866 is a wasteful number, since it uses less digits than its factorization.

6480643866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080107316.

The product of its (nonzero) digits is 3981312, while the sum is 51.

The square root of 6480643866 is about 80502.4463354996. The cubic root of 6480643866 is about 1864.4012497176.

The spelling of 6480643866 in words is "six billion, four hundred eighty million, six hundred forty-three thousand, eight hundred sixty-six".