8220318861 has 4 divisors (see below), whose sum is σ = 10960425152. Its totient is φ = 5480212572.

The previous prime is 8220318853. The next prime is 8220318889. The reversal of 8220318861 is 1688130228.

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 8220318861 - 2³ = 8220318853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8220318761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370053141 + ... + 1370053146.

It is an arithmetic number, because the mean of its divisors is an integer number (2740106288).

Almost surely, 2^8220318861 is an apocalyptic number.

It is an amenable number.

8220318861 is a deficient number, since it is larger than the sum of its proper divisors (2740106291).

8220318861 is a wasteful number, since it uses less digits than its factorization.

8220318861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740106290.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 8220318861 is about 90665.9741082618. The cubic root of 8220318861 is about 2018.1938943130.

The spelling of 8220318861 in words is "eight billion, two hundred twenty million, three hundred eighteen thousand, eight hundred sixty-one".