6438054721 has 4 divisors (see below), whose sum is σ = 7357776832. Its totient is φ = 5518332612.

The previous prime is 6438054713. The next prime is 6438054737. The reversal of 6438054721 is 1274508346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1274508346 = 2 ⋅637254173.

It is a cyclic number.

It is not a de Polignac number, because 6438054721 - 2³ = 6438054713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6438054761) 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, 459861045 + ... + 459861058.

It is an arithmetic number, because the mean of its divisors is an integer number (1839444208).

Almost surely, 2^6438054721 is an apocalyptic number.

It is an amenable number.

6438054721 is a deficient number, since it is larger than the sum of its proper divisors (919722111).

6438054721 is an equidigital number, since it uses as much as digits as its factorization.

6438054721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919722110.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 6438054721 is about 80237.4894983635. The cubic root of 6438054721 is about 1860.3081465223.

The spelling of 6438054721 in words is "six billion, four hundred thirty-eight million, fifty-four thousand, seven hundred twenty-one".