6542506540 has 48 divisors (see below), whose sum is σ = 13971444480. Its totient is φ = 2573081280.

The previous prime is 6542506511. The next prime is 6542506541. The reversal of 6542506540 is 456052456.

It is a self number, because there is not a number n which added to its sum of digits gives 6542506540.

It is not an unprimeable number, because it can be changed into a prime (6542506541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340921 + ... + 359599.

It is an arithmetic number, because the mean of its divisors is an integer number (291071760).

Almost surely, 2^6542506540 is an apocalyptic number.

It is an amenable number.

6542506540 is an abundant number, since it is smaller than the sum of its proper divisors (7428937940).

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

6542506540 is a wasteful number, since it uses less digits than its factorization.

6542506540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18982 (or 18980 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 6542506540 is about 80885.7622823696. The cubic root of 6542506540 is about 1870.3148487566.

Adding to 6542506540 its reverse (456052456), we get a palindrome (6998558996).

The spelling of 6542506540 in words is "six billion, five hundred forty-two million, five hundred six thousand, five hundred forty".