6501561312 has 96 divisors (see below), whose sum is σ = 17314577280. Its totient is φ = 2135831040.

The previous prime is 6501561289. The next prime is 6501561329. The reversal of 6501561312 is 2131651056.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×6501561312² = 84540598987390322688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6501561312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4549014 + ... + 4550442.

It is an arithmetic number, because the mean of its divisors is an integer number (180360180).

Almost surely, 2^6501561312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6501561312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8657288640).

6501561312 is an abundant number, since it is smaller than the sum of its proper divisors (10813015968).

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

6501561312 is a wasteful number, since it uses less digits than its factorization.

6501561312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096 (or 2088 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 6501561312 is about 80632.2597475725. The cubic root of 6501561312 is about 1866.4049924579.

The spelling of 6501561312 in words is "six billion, five hundred one million, five hundred sixty-one thousand, three hundred twelve".