6516983221 has 16 divisors (see below), whose sum is σ = 7496017920. Its totient is φ = 5550030720.

The previous prime is 6516983219. The next prime is 6516983243. The reversal of 6516983221 is 1223896156.

It is a cyclic number.

It is not a de Polignac number, because 6516983221 - 2¹ = 6516983219 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 (6516983281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1330545 + ... + 1335433.

It is an arithmetic number, because the mean of its divisors is an integer number (468501120).

Almost surely, 2^6516983221 is an apocalyptic number.

It is an amenable number.

6516983221 is a deficient number, since it is larger than the sum of its proper divisors (979034699).

6516983221 is a wasteful number, since it uses less digits than its factorization.

6516983221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6084.

The product of its digits is 155520, while the sum is 43.

The square root of 6516983221 is about 80727.8342394988. The cubic root of 6516983221 is about 1867.8795510567.

The spelling of 6516983221 in words is "six billion, five hundred sixteen million, nine hundred eighty-three thousand, two hundred twenty-one".