18368553309 has 8 divisors (see below), whose sum is σ = 24505826400. Its totient is φ = 12238491216.

The previous prime is 18368553283. The next prime is 18368553311. The reversal of 18368553309 is 90335586381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18368553309 - 2²⁸ = 18100117853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18368553109) 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, 1796802 + ... + 1806995.

It is an arithmetic number, because the mean of its divisors is an integer number (3063228300).

Almost surely, 2^18368553309 is an apocalyptic number.

It is an amenable number.

18368553309 is a deficient number, since it is larger than the sum of its proper divisors (6137273091).

18368553309 is a wasteful number, since it uses less digits than its factorization.

18368553309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605499.

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 18368553309 in words is "eighteen billion, three hundred sixty-eight million, five hundred fifty-three thousand, three hundred nine".