636948281071 has 2 divisors, whose sum is σ = 636948281072. Its totient is φ = 636948281070.

The previous prime is 636948281063. The next prime is 636948281113. The reversal of 636948281071 is 170182849636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 636948281071 - 2³ = 636948281063 is a prime.

It is a super-2 number, since 2×636948281071² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636948221071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318474140535 + 318474140536.

It is an arithmetic number, because the mean of its divisors is an integer number (318474140536).

Almost surely, 2^636948281071 is an apocalyptic number.

636948281071 is a deficient number, since it is larger than the sum of its proper divisors (1).

636948281071 is an equidigital number, since it uses as much as digits as its factorization.

636948281071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 636948281071 in words is "six hundred thirty-six billion, nine hundred forty-eight million, two hundred eighty-one thousand, seventy-one".