635945700509869 has 2 divisors, whose sum is σ = 635945700509870. Its totient is φ = 635945700509868.

The previous prime is 635945700509803. The next prime is 635945700509909. The reversal of 635945700509869 is 968905007549536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512806441752900 + 123139258756969 = 22645230^2 + 11096813^2 .

It is a cyclic number.

It is not a de Polignac number, because 635945700509869 - 2³⁵ = 635911340771501 is a prime.

It is a super-2 number, since 2×635945700509869² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 635945700509795 and 635945700509804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (635945700509269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317972850254934 + 317972850254935.

It is an arithmetic number, because the mean of its divisors is an integer number (317972850254935).

Almost surely, 2^{635945700509869} is an apocalyptic number.

It is an amenable number.

635945700509869 is a deficient number, since it is larger than the sum of its proper divisors (1).

635945700509869 is an equidigital number, since it uses as much as digits as its factorization.

635945700509869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2204496000, while the sum is 76.

The spelling of 635945700509869 in words is "six hundred thirty-five trillion, nine hundred forty-five billion, seven hundred million, five hundred nine thousand, eight hundred sixty-nine".