641887870937 has 2 divisors, whose sum is σ = 641887870938. Its totient is φ = 641887870936.

The previous prime is 641887870919. The next prime is 641887870979. The reversal of 641887870937 is 739078788146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578640147856 + 63247723081 = 760684^2 + 251491^2 .

It is a cyclic number.

It is not a de Polignac number, because 641887870937 - 2⁶ = 641887870873 is a prime.

It is not a weakly prime, because it can be changed into another prime (641887870997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320943935468 + 320943935469.

It is an arithmetic number, because the mean of its divisors is an integer number (320943935469).

Almost surely, 2^641887870937 is an apocalyptic number.

It is an amenable number.

641887870937 is a deficient number, since it is larger than the sum of its proper divisors (1).

641887870937 is an equidigital number, since it uses as much as digits as its factorization.

641887870937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113799168, while the sum is 68.

The spelling of 641887870937 in words is "six hundred forty-one billion, eight hundred eighty-seven million, eight hundred seventy thousand, nine hundred thirty-seven".