816776677 has 6 divisors (see below), whose sum is σ = 845913458. Its totient is φ = 788611152.

The previous prime is 816776663. The next prime is 816776683. The reversal of 816776677 is 776677618.

816776677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 350475841 + 466300836 = 18721^2 + 21594^2 .

It is not a de Polignac number, because 816776677 - 2¹⁵ = 816743909 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 (816776647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 484758 + ... + 486439.

Almost surely, 2^816776677 is an apocalyptic number.

It is an amenable number.

816776677 is a deficient number, since it is larger than the sum of its proper divisors (29136781).

816776677 is an equidigital number, since it uses as much as digits as its factorization.

816776677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971255 (or 971226 counting only the distinct ones).

The product of its digits is 4148928, while the sum is 55.

The square root of 816776677 is about 28579.3050475340. The cubic root of 816776677 is about 934.7621296196.

The spelling of 816776677 in words is "eight hundred sixteen million, seven hundred seventy-six thousand, six hundred seventy-seven".