8218742409 has 8 divisors (see below), whose sum is σ = 12175914720. Its totient is φ = 5479161588.

The previous prime is 8218742407. The next prime is 8218742423. The reversal of 8218742409 is 9042478128.

8218742409 is a `hidden beast` number, since 8 + 218 + 7 + 424 + 0 + 9 = 666.

It is not a de Polignac number, because 8218742409 - 2¹ = 8218742407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8218742407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152198907 + ... + 152198960.

It is an arithmetic number, because the mean of its divisors is an integer number (1521989340).

Almost surely, 2^8218742409 is an apocalyptic number.

It is an amenable number.

8218742409 is a deficient number, since it is larger than the sum of its proper divisors (3957172311).

8218742409 is a wasteful number, since it uses less digits than its factorization.

8218742409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304397876 (or 304397870 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 8218742409 is about 90657.2799558866. The cubic root of 8218742409 is about 2018.0648729916.

The spelling of 8218742409 in words is "eight billion, two hundred eighteen million, seven hundred forty-two thousand, four hundred nine".