816784108957 has 2 divisors, whose sum is σ = 816784108958. Its totient is φ = 816784108956.

The previous prime is 816784108939. The next prime is 816784108979. The reversal of 816784108957 is 759801487618.

816784108957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 798009902596 + 18774206361 = 893314^2 + 137019^2 .

It is a cyclic number.

It is not a de Polignac number, because 816784108957 - 2²³ = 816775720349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816784108457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408392054478 + 408392054479.

It is an arithmetic number, because the mean of its divisors is an integer number (408392054479).

Almost surely, 2^816784108957 is an apocalyptic number.

It is an amenable number.

816784108957 is a deficient number, since it is larger than the sum of its proper divisors (1).

816784108957 is an equidigital number, since it uses as much as digits as its factorization.

816784108957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27095040, while the sum is 64.

The spelling of 816784108957 in words is "eight hundred sixteen billion, seven hundred eighty-four million, one hundred eight thousand, nine hundred fifty-seven".