640455242437 has 2 divisors, whose sum is σ = 640455242438. Its totient is φ = 640455242436.

The previous prime is 640455242393. The next prime is 640455242503. The reversal of 640455242437 is 734242554046.

640455242437 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., 624912384196 + 15542858241 = 790514^2 + 124671^2 .

It is a cyclic number.

It is not a de Polignac number, because 640455242437 - 2⁷ = 640455242309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640455242837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320227621218 + 320227621219.

It is an arithmetic number, because the mean of its divisors is an integer number (320227621219).

Almost surely, 2^640455242437 is an apocalyptic number.

It is an amenable number.

640455242437 is a deficient number, since it is larger than the sum of its proper divisors (1).

640455242437 is an equidigital number, since it uses as much as digits as its factorization.

640455242437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3225600, while the sum is 46.

The spelling of 640455242437 in words is "six hundred forty billion, four hundred fifty-five million, two hundred forty-two thousand, four hundred thirty-seven".