6561200159977 has 2 divisors, whose sum is σ = 6561200159978. Its totient is φ = 6561200159976.

The previous prime is 6561200159929. The next prime is 6561200160001. The reversal of 6561200159977 is 7799510021656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4410214202601 + 2150985957376 = 2100051^2 + 1466624^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561200159977 - 2⁷ = 6561200159849 is a prime.

It is not a weakly prime, because it can be changed into another prime (6561200159677) by changing a digit.

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 as a sum of consecutive naturals, namely, 3280600079988 + 3280600079989.

It is an arithmetic number, because the mean of its divisors is an integer number (3280600079989).

Almost surely, 2^{6561200159977} is an apocalyptic number.

It is an amenable number.

6561200159977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561200159977 is an equidigital number, since it uses as much as digits as its factorization.

6561200159977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7144200, while the sum is 58.

The spelling of 6561200159977 in words is "six trillion, five hundred sixty-one billion, two hundred million, one hundred fifty-nine thousand, nine hundred seventy-seven".