640503434113 has 2 divisors, whose sum is σ = 640503434114. Its totient is φ = 640503434112.

The previous prime is 640503434029. The next prime is 640503434119. The reversal of 640503434113 is 311434305046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604773739584 + 35729694529 = 777672^2 + 189023^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640503434113 is a prime.

It is a super-2 number, since 2×640503434113² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (640503434119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320251717056 + 320251717057.

It is an arithmetic number, because the mean of its divisors is an integer number (320251717057).

Almost surely, 2^640503434113 is an apocalyptic number.

It is an amenable number.

640503434113 is a deficient number, since it is larger than the sum of its proper divisors (1).

640503434113 is an equidigital number, since it uses as much as digits as its factorization.

640503434113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 640503434113 its reverse (311434305046), we get a palindrome (951937739159).

The spelling of 640503434113 in words is "six hundred forty billion, five hundred three million, four hundred thirty-four thousand, one hundred thirteen".