641870478923 has 2 divisors, whose sum is σ = 641870478924. Its totient is φ = 641870478922.

The previous prime is 641870478883. The next prime is 641870478973. The reversal of 641870478923 is 329874078146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641870478923 - 2³⁰ = 640796737099 is a prime.

It is not a weakly prime, because it can be changed into another prime (641870478973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320935239461 + 320935239462.

It is an arithmetic number, because the mean of its divisors is an integer number (320935239462).

Almost surely, 2^641870478923 is an apocalyptic number.

641870478923 is a deficient number, since it is larger than the sum of its proper divisors (1).

641870478923 is an equidigital number, since it uses as much as digits as its factorization.

641870478923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16257024, while the sum is 59.

The spelling of 641870478923 in words is "six hundred forty-one billion, eight hundred seventy million, four hundred seventy-eight thousand, nine hundred twenty-three".