816828123077 has 4 divisors (see below), whose sum is σ = 821839338720. Its totient is φ = 811816907436.

The previous prime is 816828123053. The next prime is 816828123079. The reversal of 816828123077 is 770321828618.

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 816828123077 - 2⁸ = 816828122821 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 (816828123079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2505607577 + ... + 2505607902.

It is an arithmetic number, because the mean of its divisors is an integer number (205459834680).

Almost surely, 2^816828123077 is an apocalyptic number.

It is an amenable number.

816828123077 is a deficient number, since it is larger than the sum of its proper divisors (5011215643).

816828123077 is a wasteful number, since it uses less digits than its factorization.

816828123077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011215642.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 816828123077 in words is "eight hundred sixteen billion, eight hundred twenty-eight million, one hundred twenty-three thousand, seventy-seven".