823793477789 has 4 divisors (see below), whose sum is σ = 824040940860. Its totient is φ = 823546014720.

The previous prime is 823793477783. The next prime is 823793477803. The reversal of 823793477789 is 987774397328.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 432624538564 + 391168939225 = 657742^2 + 625435^2 .

It is a cyclic number.

It is not a de Polignac number, because 823793477789 - 2²⁴ = 823776700573 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 (823793477783) 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, 123726542 + ... + 123733199.

It is an arithmetic number, because the mean of its divisors is an integer number (206010235215).

Almost surely, 2^823793477789 is an apocalyptic number.

It is an amenable number.

823793477789 is a deficient number, since it is larger than the sum of its proper divisors (247463071).

823793477789 is a wasteful number, since it uses less digits than its factorization.

823793477789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247463070.

The product of its digits is 896168448, while the sum is 74.

The spelling of 823793477789 in words is "eight hundred twenty-three billion, seven hundred ninety-three million, four hundred seventy-seven thousand, seven hundred eighty-nine".