641515837811 has 2 divisors, whose sum is σ = 641515837812. Its totient is φ = 641515837810.

The previous prime is 641515837799. The next prime is 641515837847. The reversal of 641515837811 is 118738515146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641515837811 - 2³⁰ = 640442095987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641515837811.

It is not a weakly prime, because it can be changed into another prime (641515837111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320757918905 + 320757918906.

It is an arithmetic number, because the mean of its divisors is an integer number (320757918906).

Almost surely, 2^641515837811 is an apocalyptic number.

641515837811 is a deficient number, since it is larger than the sum of its proper divisors (1).

641515837811 is an equidigital number, since it uses as much as digits as its factorization.

641515837811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 50.

The spelling of 641515837811 in words is "six hundred forty-one billion, five hundred fifteen million, eight hundred thirty-seven thousand, eight hundred eleven".