640272481273 has 2 divisors, whose sum is σ = 640272481274. Its totient is φ = 640272481272.

The previous prime is 640272481243. The next prime is 640272481339. The reversal of 640272481273 is 372184272046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460595683584 + 179676797689 = 678672^2 + 423883^2 .

It is a cyclic number.

It is not a de Polignac number, because 640272481273 - 2²⁵ = 640238926841 is a prime.

It is not a weakly prime, because it can be changed into another prime (640272481243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320136240636 + 320136240637.

It is an arithmetic number, because the mean of its divisors is an integer number (320136240637).

Almost surely, 2^640272481273 is an apocalyptic number.

It is an amenable number.

640272481273 is a deficient number, since it is larger than the sum of its proper divisors (1).

640272481273 is an equidigital number, since it uses as much as digits as its factorization.

640272481273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 46.

The spelling of 640272481273 in words is "six hundred forty billion, two hundred seventy-two million, four hundred eighty-one thousand, two hundred seventy-three".