636371668087 has 2 divisors, whose sum is σ = 636371668088. Its totient is φ = 636371668086.

The previous prime is 636371668063. The next prime is 636371668147. The reversal of 636371668087 is 780866173636.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636371668087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636371668787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318185834043 + 318185834044.

It is an arithmetic number, because the mean of its divisors is an integer number (318185834044).

Almost surely, 2^636371668087 is an apocalyptic number.

636371668087 is a deficient number, since it is larger than the sum of its proper divisors (1).

636371668087 is an equidigital number, since it uses as much as digits as its factorization.

636371668087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36578304, while the sum is 61.

The spelling of 636371668087 in words is "six hundred thirty-six billion, three hundred seventy-one million, six hundred sixty-eight thousand, eighty-seven".