6451518720256 has 27 divisors (see below), whose sum is σ = 12877917316761. Its totient is φ = 3225739040256.

The previous prime is 6451518720191. The next prime is 6451518720263. The reversal of 6451518720256 is 6520278151546.

The square root of 6451518720256 is 2539984.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 42925209856 + 6408593510400 = 207184^2 + 2531520^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 40560370 + ... + 40719118.

Almost surely, 2^{6451518720256} is an apocalyptic number.

6451518720256 is the 2539984-th square number.

It is an amenable number.

6451518720256 is a deficient number, since it is larger than the sum of its proper divisors (6426398596505).

6451518720256 is an frugal number, since it uses more digits than its factorization.

6451518720256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317514 (or 158751 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 52.

The spelling of 6451518720256 in words is "six trillion, four hundred fifty-one billion, five hundred eighteen million, seven hundred twenty thousand, two hundred fifty-six".