641797326865 has 8 divisors (see below), whose sum is σ = 770178126888. Its totient is φ = 513423638400.

The previous prime is 641797326851. The next prime is 641797326883. The reversal of 641797326865 is 568623797146.

It can be written as a sum of positive squares in 4 ways, for example, as 40826627136 + 600970699729 = 202056^2 + 775223^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 641797326865 - 2³⁹ = 92041512977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641797326797 and 641797326806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577286 + ... + 1942015.

It is an arithmetic number, because the mean of its divisors is an integer number (96272265861).

Almost surely, 2^641797326865 is an apocalyptic number.

It is an amenable number.

641797326865 is a deficient number, since it is larger than the sum of its proper divisors (128380800023).

641797326865 is a wasteful number, since it uses less digits than its factorization.

641797326865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555779.

The product of its digits is 91445760, while the sum is 64.

The spelling of 641797326865 in words is "six hundred forty-one billion, seven hundred ninety-seven million, three hundred twenty-six thousand, eight hundred sixty-five".