640982257129 has 2 divisors, whose sum is σ = 640982257130. Its totient is φ = 640982257128.

The previous prime is 640982257121. The next prime is 640982257133. The reversal of 640982257129 is 921752289046.

It is a happy number.

640982257129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328191494400 + 312790762729 = 572880^2 + 559277^2 .

It is a cyclic number.

It is not a de Polignac number, because 640982257129 - 2³ = 640982257121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640982257129.

It is not a weakly prime, because it can be changed into another prime (640982257121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320491128564 + 320491128565.

It is an arithmetic number, because the mean of its divisors is an integer number (320491128565).

Almost surely, 2^640982257129 is an apocalyptic number.

It is an amenable number.

640982257129 is a deficient number, since it is larger than the sum of its proper divisors (1).

640982257129 is an equidigital number, since it uses as much as digits as its factorization.

640982257129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 640982257129 in words is "six hundred forty billion, nine hundred eighty-two million, two hundred fifty-seven thousand, one hundred twenty-nine".