18623242089 has 45 divisors (see below), whose sum is σ = 28409963527. Its totient is φ = 12157572096.

The previous prime is 18623242061. The next prime is 18623242109. The reversal of 18623242089 is 98024232681.

The square root of 18623242089 is 136467.

It is a perfect power (a square), and thus also a powerful number.

18623242089 is a `hidden beast` number, since 18 + 623 + 2 + 4 + 2 + 0 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18334514025 + 288728064 = 135405^2 + 16992^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18623242089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18623242009) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 72463849 + ... + 72464105.

Almost surely, 2^18623242089 is an apocalyptic number.

18623242089 is the 136467-th square number.

18623242089 is the 68234-th centered octagonal number.

It is an amenable number.

18623242089 is a deficient number, since it is larger than the sum of its proper divisors (9786721438).

18623242089 is an frugal number, since it uses more digits than its factorization.

18623242089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 18623242089 in words is "eighteen billion, six hundred twenty-three million, two hundred forty-two thousand, eighty-nine".