641878163699 has 2 divisors, whose sum is σ = 641878163700. Its totient is φ = 641878163698.

The previous prime is 641878163683. The next prime is 641878163753. The reversal of 641878163699 is 996361878146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641878163699 - 2⁴ = 641878163683 is a prime.

It is not a weakly prime, because it can be changed into another prime (641878163639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320939081849 + 320939081850.

It is an arithmetic number, because the mean of its divisors is an integer number (320939081850).

Almost surely, 2^641878163699 is an apocalyptic number.

641878163699 is a deficient number, since it is larger than the sum of its proper divisors (1).

641878163699 is an equidigital number, since it uses as much as digits as its factorization.

641878163699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 68.

The spelling of 641878163699 in words is "six hundred forty-one billion, eight hundred seventy-eight million, one hundred sixty-three thousand, six hundred ninety-nine".