6561200160001 has 2 divisors, whose sum is σ = 6561200160002. Its totient is φ = 6561200160000.

The previous prime is 6561200159977. The next prime is 6561200160023. The reversal of 6561200160001 is 1000610021656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6537614879376 + 23585280625 = 2556876^2 + 153575^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561200160001 - 2⁷ = 6561200159873 is a prime.

It is not a weakly prime, because it can be changed into another prime (6561200169001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280600080000 + 3280600080001.

It is an arithmetic number, because the mean of its divisors is an integer number (3280600080001).

Almost surely, 2^{6561200160001} is an apocalyptic number.

It is an amenable number.

6561200160001 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561200160001 is an equidigital number, since it uses as much as digits as its factorization.

6561200160001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 6561200160001 its reverse (1000610021656), we get a palindrome (7561810181657).

The spelling of 6561200160001 in words is "six trillion, five hundred sixty-one billion, two hundred million, one hundred sixty thousand, one".