6515221168 has 40 divisors (see below), whose sum is σ = 13451005152. Its totient is φ = 3046437888.

The previous prime is 6515221147. The next prime is 6515221187. The reversal of 6515221168 is 8611225156.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33580 + ... + 118987.

Almost surely, 2^6515221168 is an apocalyptic number.

6515221168 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6515221168 is an abundant number, since it is smaller than the sum of its proper divisors (6935783984).

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

6515221168 is a wasteful number, since it uses less digits than its factorization.

6515221168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152749 (or 152743 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 6515221168 is about 80716.9199610590. The cubic root of 6515221168 is about 1867.7111909770.

It can be divided in two parts, 65152 and 21168, that added together give a triangular number (86320 = T₄₁₅).

The spelling of 6515221168 in words is "six billion, five hundred fifteen million, two hundred twenty-one thousand, one hundred sixty-eight".