6537163643561 has 4 divisors (see below), whose sum is σ = 6598258630992. Its totient is φ = 6476068656132.

The previous prime is 6537163643537. The next prime is 6537163643641. The reversal of 6537163643561 is 1653463617356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6537163643561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6537163643497 and 6537163643506.

It is not an unprimeable number, because it can be changed into a prime (6537163643531) 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, 30547493555 + ... + 30547493768.

It is an arithmetic number, because the mean of its divisors is an integer number (1649564657748).

Almost surely, 2^{6537163643561} is an apocalyptic number.

It is an amenable number.

6537163643561 is a deficient number, since it is larger than the sum of its proper divisors (61094987431).

6537163643561 is a wasteful number, since it uses less digits than its factorization.

6537163643561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61094987430.

The product of its digits is 24494400, while the sum is 56.

The spelling of 6537163643561 in words is "six trillion, five hundred thirty-seven billion, one hundred sixty-three million, six hundred forty-three thousand, five hundred sixty-one".