816784108977 has 4 divisors (see below), whose sum is σ = 1089045478640. Its totient is φ = 544522739316.

The previous prime is 816784108957. The next prime is 816784108979. The reversal of 816784108977 is 779801487618.

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 not a de Polignac number, because 816784108977 - 2¹⁵ = 816784076209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816784108979) 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, 136130684827 + ... + 136130684832.

It is an arithmetic number, because the mean of its divisors is an integer number (272261369660).

Almost surely, 2^816784108977 is an apocalyptic number.

It is an amenable number.

816784108977 is a deficient number, since it is larger than the sum of its proper divisors (272261369663).

816784108977 is a wasteful number, since it uses less digits than its factorization.

816784108977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272261369662.

The product of its (nonzero) digits is 37933056, while the sum is 66.

The spelling of 816784108977 in words is "eight hundred sixteen billion, seven hundred eighty-four million, one hundred eight thousand, nine hundred seventy-seven".