6512721064 has 32 divisors (see below), whose sum is σ = 12509549280. Its totient is φ = 3177751104.

The previous prime is 6512721031. The next prime is 6512721073. The reversal of 6512721064 is 4601272156.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574 + ... + 114130.

It is an arithmetic number, because the mean of its divisors is an integer number (390923415).

Almost surely, 2^6512721064 is an apocalyptic number.

It is an amenable number.

6512721064 is a deficient number, since it is larger than the sum of its proper divisors (5996828216).

6512721064 is a wasteful number, since it uses less digits than its factorization.

6512721064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113737 (or 113733 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 6512721064 is about 80701.4316105978. The cubic root of 6512721064 is about 1867.4722597367.

The spelling of 6512721064 in words is "six billion, five hundred twelve million, seven hundred twenty-one thousand, sixty-four".