820327844065 has 16 divisors (see below), whose sum is σ = 988324459776. Its totient is φ = 653643043200.

The previous prime is 820327844047. The next prime is 820327844107. The reversal of 820327844065 is 560448723028.

It is not a de Polignac number, because 820327844065 - 2⁵ = 820327844033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4477909 + ... + 4657501.

It is an arithmetic number, because the mean of its divisors is an integer number (61770278736).

Almost surely, 2^820327844065 is an apocalyptic number.

It is an amenable number.

820327844065 is a deficient number, since it is larger than the sum of its proper divisors (167996615711).

820327844065 is a wasteful number, since it uses less digits than its factorization.

820327844065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183240.

The product of its (nonzero) digits is 2580480, while the sum is 49.

The spelling of 820327844065 in words is "eight hundred twenty billion, three hundred twenty-seven million, eight hundred forty-four thousand, sixty-five".