6664617880 has 32 divisors (see below), whose sum is σ = 14999119200. Its totient is φ = 2665184256.

The previous prime is 6664617877. The next prime is 6664617881. The reversal of 6664617880 is 887164666.

It is a happy number.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664617881) 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, 162061 + ... + 198979.

It is an arithmetic number, because the mean of its divisors is an integer number (468722475).

Almost surely, 2^6664617880 is an apocalyptic number.

It is an amenable number.

6664617880 is an abundant number, since it is smaller than the sum of its proper divisors (8334501320).

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

6664617880 is a wasteful number, since it uses less digits than its factorization.

6664617880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41443 (or 41439 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The square root of 6664617880 is about 81637.1109238929. The cubic root of 6664617880 is about 1881.8792398017.

The spelling of 6664617880 in words is "six billion, six hundred sixty-four million, six hundred seventeen thousand, eight hundred eighty".