640427210273 has 2 divisors, whose sum is σ = 640427210274. Its totient is φ = 640427210272.

The previous prime is 640427210251. The next prime is 640427210281. The reversal of 640427210273 is 372012724046.

It is a happy number.

640427210273 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., 495210578944 + 145216631329 = 703712^2 + 381073^2 .

It is a cyclic number.

It is not a de Polignac number, because 640427210273 - 2⁶ = 640427210209 is a prime.

It is not a weakly prime, because it can be changed into another prime (640427210233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320213605136 + 320213605137.

It is an arithmetic number, because the mean of its divisors is an integer number (320213605137).

Almost surely, 2^640427210273 is an apocalyptic number.

It is an amenable number.

640427210273 is a deficient number, since it is larger than the sum of its proper divisors (1).

640427210273 is an equidigital number, since it uses as much as digits as its factorization.

640427210273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 38.

The spelling of 640427210273 in words is "six hundred forty billion, four hundred twenty-seven million, two hundred ten thousand, two hundred seventy-three".