8221708566831 has 4 divisors (see below), whose sum is σ = 10962278089112. Its totient is φ = 5481139044552.

The previous prime is 8221708566733. The next prime is 8221708566859. The reversal of 8221708566831 is 1386658071228.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8221708566831 - 2¹⁵ = 8221708534063 is a prime.

It is a super-2 number, since 2×8221708566831² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221708566871) 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, 1370284761136 + ... + 1370284761141.

It is an arithmetic number, because the mean of its divisors is an integer number (2740569522278).

Almost surely, 2^{8221708566831} is an apocalyptic number.

8221708566831 is a deficient number, since it is larger than the sum of its proper divisors (2740569522281).

8221708566831 is a wasteful number, since it uses less digits than its factorization.

8221708566831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740569522280.

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 8221708566831 in words is "eight trillion, two hundred twenty-one billion, seven hundred eight million, five hundred sixty-six thousand, eight hundred thirty-one".