640820611283 has 2 divisors, whose sum is σ = 640820611284. Its totient is φ = 640820611282.

The previous prime is 640820611271. The next prime is 640820611339. The reversal of 640820611283 is 382116028046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640820611283 - 2⁸ = 640820611027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640820611283.

It is not a weakly prime, because it can be changed into another prime (640820614283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320410305641 + 320410305642.

It is an arithmetic number, because the mean of its divisors is an integer number (320410305642).

Almost surely, 2^640820611283 is an apocalyptic number.

640820611283 is a deficient number, since it is larger than the sum of its proper divisors (1).

640820611283 is an equidigital number, since it uses as much as digits as its factorization.

640820611283 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 640820611283 in words is "six hundred forty billion, eight hundred twenty million, six hundred eleven thousand, two hundred eighty-three".