6650211721 has 8 divisors (see below), whose sum is σ = 6662172800. Its totient is φ = 6638263632.

The previous prime is 6650211719. The next prime is 6650211751. The reversal of 6650211721 is 1271120566.

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

It is a cyclic number.

It is not a de Polignac number, because 6650211721 - 2¹ = 6650211719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6650211751) 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, 1737616 + ... + 1741438.

It is an arithmetic number, because the mean of its divisors is an integer number (832771600).

Almost surely, 2^6650211721 is an apocalyptic number.

It is an amenable number.

6650211721 is a deficient number, since it is larger than the sum of its proper divisors (11961079).

6650211721 is a wasteful number, since it uses less digits than its factorization.

6650211721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 6650211721 is about 81548.8302859091. The cubic root of 6650211721 is about 1880.5223123404.

The spelling of 6650211721 in words is "six billion, six hundred fifty million, two hundred eleven thousand, seven hundred twenty-one".