8211877705 has 4 divisors (see below), whose sum is σ = 9854253252. Its totient is φ = 6569502160.

The previous prime is 8211877651. The next prime is 8211877733. The reversal of 8211877705 is 5077781128.

8211877705 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4154060304 + 4057817401 = 64452^2 + 63701^2 .

It is not a de Polignac number, because 8211877705 - 2¹¹ = 8211875657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821187766 + ... + 821187775.

It is an arithmetic number, because the mean of its divisors is an integer number (2463563313).

Almost surely, 2^8211877705 is an apocalyptic number.

It is an amenable number.

8211877705 is a deficient number, since it is larger than the sum of its proper divisors (1642375547).

8211877705 is a wasteful number, since it uses less digits than its factorization.

8211877705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642375546.

The product of its (nonzero) digits is 219520, while the sum is 46.

The square root of 8211877705 is about 90619.4113035392. The cubic root of 8211877705 is about 2017.5028536408.

The spelling of 8211877705 in words is "eight billion, two hundred eleven million, eight hundred seventy-seven thousand, seven hundred five".