823975577821 has 8 divisors (see below), whose sum is σ = 902380048704. Its totient is φ = 746154040320.

The previous prime is 823975577813. The next prime is 823975577857. The reversal of 823975577821 is 128775579328.

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

It is a cyclic number.

It is not a de Polignac number, because 823975577821 - 2³ = 823975577813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823975575821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145730385 + ... + 145736038.

It is an arithmetic number, because the mean of its divisors is an integer number (112797506088).

Almost surely, 2^823975577821 is an apocalyptic number.

It is an amenable number.

823975577821 is a deficient number, since it is larger than the sum of its proper divisors (78404470883).

823975577821 is a wasteful number, since it uses less digits than its factorization.

823975577821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291466691.

The product of its digits is 59270400, while the sum is 64.

The spelling of 823975577821 in words is "eight hundred twenty-three billion, nine hundred seventy-five million, five hundred seventy-seven thousand, eight hundred twenty-one".