6393441681 has 27 divisors (see below), whose sum is σ = 10155027337. Its totient is φ = 3873213960.

The previous prime is 6393441667. The next prime is 6393441683. The reversal of 6393441681 is 1861443936.

The square root of 6393441681 is 79959.

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

6393441681 is a `hidden beast` number, since 63 + 93 + 441 + 68 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-6393441681 is a prime.

It is a super-2 number, since 2×6393441681² = 81752193056696211522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6393441683) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2637436 + ... + 2639858.

Almost surely, 2^6393441681 is an apocalyptic number.

6393441681 is the 79959-th square number.

6393441681 is the 39980-th centered octagonal number.

It is an amenable number.

6393441681 is a deficient number, since it is larger than the sum of its proper divisors (3761585656).

6393441681 is an equidigital number, since it uses as much as digits as its factorization.

6393441681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874 (or 2437 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The cubic root of 6393441681 is about 1856.0011287747.

The spelling of 6393441681 in words is "six billion, three hundred ninety-three million, four hundred forty-one thousand, six hundred eighty-one".