6240540681 has 6 divisors (see below), whose sum is σ = 9014114330. Its totient is φ = 4160360448.

The previous prime is 6240540673. The next prime is 6240540697. The reversal of 6240540681 is 1860450426.

6240540681 is a `hidden beast` number, since 6 + 240 + 5 + 406 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5850873081 + 389667600 = 76491^2 + 19740^2 .

It is not a de Polignac number, because 6240540681 - 2³ = 6240540673 is a prime.

It is a super-2 number, since 2×6240540681² = 77888695982431887522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6240540611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 346696696 + ... + 346696713.

Almost surely, 2^6240540681 is an apocalyptic number.

It is an amenable number.

6240540681 is a deficient number, since it is larger than the sum of its proper divisors (2773573649).

6240540681 is a wasteful number, since it uses less digits than its factorization.

6240540681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693393415 (or 693393412 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 6240540681 is about 78997.0928642314. The cubic root of 6240540681 is about 1841.0859886568.

The spelling of 6240540681 in words is "six billion, two hundred forty million, five hundred forty thousand, six hundred eighty-one".