36686685809 has 2 divisors, whose sum is σ = 36686685810. Its totient is φ = 36686685808.

The previous prime is 36686685803. The next prime is 36686685811. The reversal of 36686685809 is 90858668663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35703236209 + 983449600 = 188953^2 + 31360^2 .

It is a cyclic number.

It is not a de Polignac number, because 36686685809 - 2²⁴ = 36669908593 is a prime.

Together with 36686685811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (36686685803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18343342904 + 18343342905.

It is an arithmetic number, because the mean of its divisors is an integer number (18343342905).

Almost surely, 2^36686685809 is an apocalyptic number.

It is an amenable number.

36686685809 is a deficient number, since it is larger than the sum of its proper divisors (1).

36686685809 is an equidigital number, since it uses as much as digits as its factorization.

36686685809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89579520, while the sum is 65.

The spelling of 36686685809 in words is "thirty-six billion, six hundred eighty-six million, six hundred eighty-five thousand, eight hundred nine".