823340941605891 has 6 divisors (see below), whose sum is σ = 1189270248986300. Its totient is φ = 548893961070588.

The previous prime is 823340941605877. The next prime is 823340941605937. The reversal of 823340941605891 is 198506149043328.

823340941605891 is a `hidden beast` number, since 8 + 2 + 3 + 3 + 4 + 0 + 9 + 41 + 6 + 0 + 589 + 1 = 666.

It is not a de Polignac number, because 823340941605891 - 2³⁹ = 822791185792003 is a prime.

It is a super-2 number, since 2×823340941605891² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823340941605841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45741163422541 + ... + 45741163422558.

Almost surely, 2^{823340941605891} is an apocalyptic number.

823340941605891 is a deficient number, since it is larger than the sum of its proper divisors (365929307380409).

823340941605891 is a wasteful number, since it uses less digits than its factorization.

823340941605891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91482326845105 (or 91482326845102 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 823340941605891 in words is "eight hundred twenty-three trillion, three hundred forty billion, nine hundred forty-one million, six hundred five thousand, eight hundred ninety-one".