640252199 has 2 divisors, whose sum is σ = 640252200. Its totient is φ = 640252198.

The previous prime is 640252163. The next prime is 640252271. The reversal of 640252199 is 991252046.

640252199 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-640252199 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640252099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320126099 + 320126100.

It is an arithmetic number, because the mean of its divisors is an integer number (320126100).

Almost surely, 2^640252199 is an apocalyptic number.

640252199 is a deficient number, since it is larger than the sum of its proper divisors (1).

640252199 is an equidigital number, since it uses as much as digits as its factorization.

640252199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 640252199 is about 25303.2053107902. The cubic root of 640252199 is about 861.8870582876.

The spelling of 640252199 in words is "six hundred forty million, two hundred fifty-two thousand, one hundred ninety-nine".