6664720586 has 8 divisors (see below), whose sum is σ = 10229571264. Its totient is φ = 3254863500.

The previous prime is 6664720577. The next prime is 6664720591. The reversal of 6664720586 is 6850274666.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38748290 + ... + 38748461.

It is an arithmetic number, because the mean of its divisors is an integer number (1278696408).

Almost surely, 2^6664720586 is an apocalyptic number.

6664720586 is a deficient number, since it is larger than the sum of its proper divisors (3564850678).

6664720586 is a wasteful number, since it uses less digits than its factorization.

6664720586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77496796.

The product of its (nonzero) digits is 2903040, while the sum is 50.

The square root of 6664720586 is about 81637.7399613684. The cubic root of 6664720586 is about 1881.8889067373. Note that the first 3 decimals are identical.

The spelling of 6664720586 in words is "six billion, six hundred sixty-four million, seven hundred twenty thousand, five hundred eighty-six".