645068804113 has 2 divisors, whose sum is σ = 645068804114. Its totient is φ = 645068804112.

The previous prime is 645068804087. The next prime is 645068804119. The reversal of 645068804113 is 311408860546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613287898129 + 31780905984 = 783127^2 + 178272^2 .

It is a cyclic number.

It is not a de Polignac number, because 645068804113 - 2⁹ = 645068803601 is a prime.

It is a super-2 number, since 2×645068804113² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (645068804119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322534402056 + 322534402057.

It is an arithmetic number, because the mean of its divisors is an integer number (322534402057).

Almost surely, 2^645068804113 is an apocalyptic number.

It is an amenable number.

645068804113 is a deficient number, since it is larger than the sum of its proper divisors (1).

645068804113 is an equidigital number, since it uses as much as digits as its factorization.

645068804113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 645068804113 in words is "six hundred forty-five billion, sixty-eight million, eight hundred four thousand, one hundred thirteen".