6664516620 has 24 divisors (see below), whose sum is σ = 18660646704. Its totient is φ = 1777204416.

The previous prime is 6664516619. The next prime is 6664516687. The reversal of 6664516620 is 266154666.

It is a happy 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, 55537579 + ... + 55537698.

It is an arithmetic number, because the mean of its divisors is an integer number (777526946).

Almost surely, 2^6664516620 is an apocalyptic number.

6664516620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6664516620 is an abundant number, since it is smaller than the sum of its proper divisors (11996130084).

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

6664516620 is a wasteful number, since it uses less digits than its factorization.

6664516620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111075289 (or 111075287 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 6664516620 is about 81636.4907379047. The cubic root of 6664516620 is about 1881.8697088698.

The spelling of 6664516620 in words is "six billion, six hundred sixty-four million, five hundred sixteen thousand, six hundred twenty".