6511000064 has 40 divisors (see below), whose sum is σ = 13143499908. Its totient is φ = 3221913600.

The previous prime is 6511000061. The next prime is 6511000073. The reversal of 6511000064 is 4600001156.

It can be written as a sum of positive squares in 2 ways, for example, as 6489913600 + 21086464 = 80560^2 + 4592^2 .

It is not an unprimeable number, because it can be changed into a prime (6511000061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15887 + ... + 115214.

Almost surely, 2^6511000064 is an apocalyptic number.

6511000064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6511000064 is an abundant number, since it is smaller than the sum of its proper divisors (6632499844).

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

6511000064 is an equidigital number, since it uses as much as digits as its factorization.

6511000064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131216 (or 131200 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 6511000064 is about 80690.7681460525. The cubic root of 6511000064 is about 1867.3077507773.

The spelling of 6511000064 in words is "six billion, five hundred eleven million, sixty-four", and thus it is an aban number.