18150311609 has 4 divisors (see below), whose sum is σ = 18939455616. Its totient is φ = 17361167604.

The previous prime is 18150311603. The next prime is 18150311639. The reversal of 18150311609 is 90611305181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90611305181 = 36847 ⋅2459123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18150311609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18150311603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394571969 + ... + 394572014.

It is an arithmetic number, because the mean of its divisors is an integer number (4734863904).

Almost surely, 2^18150311609 is an apocalyptic number.

It is an amenable number.

18150311609 is a deficient number, since it is larger than the sum of its proper divisors (789144007).

18150311609 is an equidigital number, since it uses as much as digits as its factorization.

18150311609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789144006.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 18150311609 in words is "eighteen billion, one hundred fifty million, three hundred eleven thousand, six hundred nine".