6541136440 has 16 divisors (see below), whose sum is σ = 14717557080. Its totient is φ = 2616454560.

The previous prime is 6541136429. The next prime is 6541136443. The reversal of 6541136440 is 446311456.

It is a junction number, because it is equal to n+sod(n) for n = 6541136396 and 6541136405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541136443) 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, 81764166 + ... + 81764245.

Almost surely, 2^6541136440 is an apocalyptic number.

It is an amenable number.

6541136440 is an abundant number, since it is smaller than the sum of its proper divisors (8176420640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6541136440 is a wasteful number, since it uses less digits than its factorization.

6541136440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163528422 (or 163528418 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 6541136440 is about 80877.2924868285. The cubic root of 6541136440 is about 1870.1842822193.

Adding to 6541136440 its reverse (446311456), we get a palindrome (6987447896).

The spelling of 6541136440 in words is "six billion, five hundred forty-one million, one hundred thirty-six thousand, four hundred forty".