6501265578 has 80 divisors (see below), whose sum is σ = 14906928960. Its totient is φ = 2117081664.

The previous prime is 6501265571. The next prime is 6501265607. The reversal of 6501265578 is 8755621056.

6501265578 is a `hidden beast` number, since 6 + 5 + 0 + 12 + 65 + 578 = 666.

It is not an unprimeable number, because it can be changed into a prime (6501265571) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 1594150 + ... + 1598222.

It is an arithmetic number, because the mean of its divisors is an integer number (186336612).

Almost surely, 2^6501265578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6501265578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7453464480).

6501265578 is an abundant number, since it is smaller than the sum of its proper divisors (8405663382).

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

6501265578 is a wasteful number, since it uses less digits than its factorization.

6501265578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4313 (or 4304 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The square root of 6501265578 is about 80630.4258825414. The cubic root of 6501265578 is about 1866.3766932152.

The spelling of 6501265578 in words is "six billion, five hundred one million, two hundred sixty-five thousand, five hundred seventy-eight".