6539540736961 has 8 divisors (see below), whose sum is σ = 6551660075400. Its totient is φ = 6527432325120.

The previous prime is 6539540736931. The next prime is 6539540736997. The reversal of 6539540736961 is 1696370459356.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1371393234225 + 5168147502736 = 1171065^2 + 2273356^2 .

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 6539540736961 - 2¹¹ = 6539540734913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6539540736893 and 6539540736902.

It is not an unprimeable number, because it can be changed into a prime (6539540736931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1533060 + ... + 3928021.

It is an arithmetic number, because the mean of its divisors is an integer number (818957509425).

Almost surely, 2^{6539540736961} is an apocalyptic number.

It is an amenable number.

6539540736961 is a deficient number, since it is larger than the sum of its proper divisors (12119338439).

6539540736961 is a wasteful number, since it uses less digits than its factorization.

6539540736961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463299.

The product of its (nonzero) digits is 110224800, while the sum is 64.

The spelling of 6539540736961 in words is "six trillion, five hundred thirty-nine billion, five hundred forty million, seven hundred thirty-six thousand, nine hundred sixty-one".