6660650621 has 8 divisors (see below), whose sum is σ = 7012918080. Its totient is φ = 6308553888.

The previous prime is 6660650617. The next prime is 6660650629. The reversal of 6660650621 is 1260560666.

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

It is not a de Polignac number, because 6660650621 - 2² = 6660650617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660650629) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41705 + ... + 122721.

It is an arithmetic number, because the mean of its divisors is an integer number (876614760).

Almost surely, 2^6660650621 is an apocalyptic number.

It is an amenable number.

6660650621 is a deficient number, since it is larger than the sum of its proper divisors (352267459).

6660650621 is a wasteful number, since it uses less digits than its factorization.

6660650621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85363.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 6660650621 is about 81612.8091723352. The cubic root of 6660650621 is about 1881.5057558106.

The spelling of 6660650621 in words is "six billion, six hundred sixty million, six hundred fifty thousand, six hundred twenty-one".