640503434029 has 2 divisors, whose sum is σ = 640503434030. Its totient is φ = 640503434028.

The previous prime is 640503434027. The next prime is 640503434113. The reversal of 640503434029 is 920434305046.

640503434029 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609964124004 + 30539310025 = 781002^2 + 174755^2 .

It is a cyclic number.

It is not a de Polignac number, because 640503434029 - 2¹ = 640503434027 is a prime.

Together with 640503434027, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 640503433982 and 640503434000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640503434023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320251717014 + 320251717015.

It is an arithmetic number, because the mean of its divisors is an integer number (320251717015).

Almost surely, 2^640503434029 is an apocalyptic number.

It is an amenable number.

640503434029 is a deficient number, since it is larger than the sum of its proper divisors (1).

640503434029 is an equidigital number, since it uses as much as digits as its factorization.

640503434029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 640503434029 in words is "six hundred forty billion, five hundred three million, four hundred thirty-four thousand, twenty-nine".