640377299 has 2 divisors, whose sum is σ = 640377300. Its totient is φ = 640377298.

The previous prime is 640377271. The next prime is 640377341. The reversal of 640377299 is 992773046.

640377299 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640377299 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (640377229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320188649 + 320188650.

It is an arithmetic number, because the mean of its divisors is an integer number (320188650).

Almost surely, 2^640377299 is an apocalyptic number.

640377299 is a deficient number, since it is larger than the sum of its proper divisors (1).

640377299 is an equidigital number, since it uses as much as digits as its factorization.

640377299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 47.

The square root of 640377299 is about 25305.6772088794. The cubic root of 640377299 is about 861.9431898399.

The spelling of 640377299 in words is "six hundred forty million, three hundred seventy-seven thousand, two hundred ninety-nine".