18215052489 has 6 divisors (see below), whose sum is σ = 26310631386. Its totient is φ = 12143368320.

The previous prime is 18215052467. The next prime is 18215052517. The reversal of 18215052489 is 98425051281.

18215052489 is a `hidden beast` number, since 18 + 2 + 150 + 5 + 2 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17710286400 + 504766089 = 133080^2 + 22467^2 .

It is not a de Polignac number, because 18215052489 - 2¹³ = 18215044297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18215052439) 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, 1011947352 + ... + 1011947369.

It is an arithmetic number, because the mean of its divisors is an integer number (4385105231).

Almost surely, 2^18215052489 is an apocalyptic number.

It is an amenable number.

18215052489 is a deficient number, since it is larger than the sum of its proper divisors (8095578897).

18215052489 is a wasteful number, since it uses less digits than its factorization.

18215052489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023894727 (or 2023894724 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 18215052489 in words is "eighteen billion, two hundred fifteen million, fifty-two thousand, four hundred eighty-nine".