6468282721 has 4 divisors (see below), whose sum is σ = 6509482132. Its totient is φ = 6427083312.

The previous prime is 6468282707. The next prime is 6468282767. The reversal of 6468282721 is 1272828646.

6468282721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1272828646 = 2 ⋅636414323.

It can be written as a sum of positive squares in 2 ways, for example, as 2687385600 + 3780897121 = 51840^2 + 61489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6468282721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6468282701) 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, 20599470 + ... + 20599783.

It is an arithmetic number, because the mean of its divisors is an integer number (1627370533).

Almost surely, 2^6468282721 is an apocalyptic number.

It is an amenable number.

6468282721 is a deficient number, since it is larger than the sum of its proper divisors (41199411).

6468282721 is a wasteful number, since it uses less digits than its factorization.

6468282721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41199410.

The product of its digits is 516096, while the sum is 46.

The square root of 6468282721 is about 80425.6347255028. The cubic root of 6468282721 is about 1863.2151123059.

The spelling of 6468282721 in words is "six billion, four hundred sixty-eight million, two hundred eighty-two thousand, seven hundred twenty-one".