36518684561 has 2 divisors, whose sum is σ = 36518684562. Its totient is φ = 36518684560.

The previous prime is 36518684549. The next prime is 36518684597. The reversal of 36518684561 is 16548681563.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32173238161 + 4345446400 = 179369^2 + 65920^2 .

It is an emirp because it is prime and its reverse (16548681563) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36518684561 - 2²⁶ = 36451575697 is a prime.

It is a super-2 number, since 2×36518684561² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (36518654561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18259342280 + 18259342281.

It is an arithmetic number, because the mean of its divisors is an integer number (18259342281).

Almost surely, 2^36518684561 is an apocalyptic number.

It is an amenable number.

36518684561 is a deficient number, since it is larger than the sum of its proper divisors (1).

36518684561 is an equidigital number, since it uses as much as digits as its factorization.

36518684561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 53.

The spelling of 36518684561 in words is "thirty-six billion, five hundred eighteen million, six hundred eighty-four thousand, five hundred sixty-one".