6542522521 has 8 divisors (see below), whose sum is σ = 6794849160. Its totient is φ = 6294169728.

The previous prime is 6542522489. The next prime is 6542522527. The reversal of 6542522521 is 1252252456.

It can be written as a sum of positive squares in 4 ways, for example, as 814303296 + 5728219225 = 28536^2 + 75685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6542522521 - 2⁵ = 6542522489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6542522527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 990106 + ... + 996691.

It is an arithmetic number, because the mean of its divisors is an integer number (849356145).

Almost surely, 2^6542522521 is an apocalyptic number.

It is an amenable number.

6542522521 is a deficient number, since it is larger than the sum of its proper divisors (252326639).

6542522521 is a wasteful number, since it uses less digits than its factorization.

6542522521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986923.

The product of its digits is 48000, while the sum is 34.

The square root of 6542522521 is about 80885.8610697815. The cubic root of 6542522521 is about 1870.3163715918.

Adding to 6542522521 its reverse (1252252456), we get a palindrome (7794774977).

The spelling of 6542522521 in words is "six billion, five hundred forty-two million, five hundred twenty-two thousand, five hundred twenty-one".