18291689089 has 8 divisors (see below), whose sum is σ = 18386542440. Its totient is φ = 18197056896.

The previous prime is 18291689083. The next prime is 18291689107. The reversal of 18291689089 is 98098619281.

It can be written as a sum of positive squares in 4 ways, for example, as 4610410000 + 13681279089 = 67900^2 + 116967^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18291689089 - 2⁵ = 18291689057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18291689083) 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, 111859 + ... + 221575.

It is an arithmetic number, because the mean of its divisors is an integer number (2298317805).

Almost surely, 2^18291689089 is an apocalyptic number.

It is an amenable number.

18291689089 is a deficient number, since it is larger than the sum of its proper divisors (94853351).

18291689089 is a wasteful number, since it uses less digits than its factorization.

18291689089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110579.

The product of its (nonzero) digits is 4478976, while the sum is 61.

The spelling of 18291689089 in words is "eighteen billion, two hundred ninety-one million, six hundred eighty-nine thousand, eighty-nine".