823255083821 has 4 divisors (see below), whose sum is σ = 826385331552. Its totient is φ = 820124836092.

The previous prime is 823255083787. The next prime is 823255083869. The reversal of 823255083821 is 128380552328.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 823255083821 - 2⁶ = 823255083757 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 (823255083221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1565123471 + ... + 1565123996.

It is an arithmetic number, because the mean of its divisors is an integer number (206596332888).

Almost surely, 2^823255083821 is an apocalyptic number.

It is an amenable number.

823255083821 is a deficient number, since it is larger than the sum of its proper divisors (3130247731).

823255083821 is a wasteful number, since it uses less digits than its factorization.

823255083821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130247730.

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 823255083821 in words is "eight hundred twenty-three billion, two hundred fifty-five million, eighty-three thousand, eight hundred twenty-one".