640050377 has 2 divisors, whose sum is σ = 640050378. Its totient is φ = 640050376.

The previous prime is 640050373. The next prime is 640050403. The reversal of 640050377 is 773050046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402243136 + 237807241 = 20056^2 + 15421^2 .

It is a cyclic number.

It is not a de Polignac number, because 640050377 - 2² = 640050373 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640050373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320025188 + 320025189.

It is an arithmetic number, because the mean of its divisors is an integer number (320025189).

Almost surely, 2^640050377 is an apocalyptic number.

It is an amenable number.

640050377 is a deficient number, since it is larger than the sum of its proper divisors (1).

640050377 is an equidigital number, since it uses as much as digits as its factorization.

640050377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 640050377 is about 25299.2169246402. The cubic root of 640050377 is about 861.7964866604.

The spelling of 640050377 in words is "six hundred forty million, fifty thousand, three hundred seventy-seven".