36543604561 has 2 divisors, whose sum is σ = 36543604562. Its totient is φ = 36543604560.

The previous prime is 36543604541. The next prime is 36543604597. The reversal of 36543604561 is 16540634563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27842259600 + 8701344961 = 166860^2 + 93281^2 .

It is a cyclic number.

It is not a de Polignac number, because 36543604561 - 2¹⁵ = 36543571793 is a prime.

It is not a weakly prime, because it can be changed into another prime (36543604501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18271802280 + 18271802281.

It is an arithmetic number, because the mean of its divisors is an integer number (18271802281).

Almost surely, 2^36543604561 is an apocalyptic number.

It is an amenable number.

36543604561 is a deficient number, since it is larger than the sum of its proper divisors (1).

36543604561 is an equidigital number, since it uses as much as digits as its factorization.

36543604561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 36543604561 in words is "thirty-six billion, five hundred forty-three million, six hundred four thousand, five hundred sixty-one".