18361063009 has 9 divisors (see below), whose sum is σ = 18488635347. Its totient is φ = 18234367704.

The previous prime is 18361062989. The next prime is 18361063111. The reversal of 18361063009 is 90036016381.

The square root of 18361063009 is 135503.

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

It can be written as a sum of positive squares in only one way, i.e., 11343315025 + 7017747984 = 106505^2 + 83772^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18361063009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18361063309) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24254659 + ... + 24255415.

Almost surely, 2^18361063009 is an apocalyptic number.

18361063009 is the 135503-rd square number.

18361063009 is the 67752-nd centered octagonal number.

It is an amenable number.

18361063009 is a deficient number, since it is larger than the sum of its proper divisors (127572338).

18361063009 is an frugal number, since it uses more digits than its factorization.

18361063009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872 (or 936 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 18361063009 in words is "eighteen billion, three hundred sixty-one million, sixty-three thousand, nine".