6542544647540 has 96 divisors (see below), whose sum is σ = 15473901477888. Its totient is φ = 2302059600000.

The previous prime is 6542544647521. The next prime is 6542544647609. The reversal of 6542544647540 is 457464452456.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55503665 + ... + 55621415.

It is an arithmetic number, because the mean of its divisors is an integer number (161186473728).

Almost surely, 2^{6542544647540} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6542544647540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7736950738944).

6542544647540 is an abundant number, since it is smaller than the sum of its proper divisors (8931356830348).

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

6542544647540 is a wasteful number, since it uses less digits than its factorization.

6542544647540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125949 (or 125947 counting only the distinct ones).

The product of its (nonzero) digits is 64512000, while the sum is 56.

The spelling of 6542544647540 in words is "six trillion, five hundred forty-two billion, five hundred forty-four million, six hundred forty-seven thousand, five hundred forty".