18309115522 has 4 divisors (see below), whose sum is σ = 27463673286. Its totient is φ = 9154557760.

The previous prime is 18309115507. The next prime is 18309115529. The reversal of 18309115522 is 22551190381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18074382481 + 234733041 = 134441^2 + 15321^2 .

It is a super-2 number, since 2×18309115522² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18309115529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4577278879 + ... + 4577278882.

Almost surely, 2^18309115522 is an apocalyptic number.

18309115522 is a deficient number, since it is larger than the sum of its proper divisors (9154557764).

18309115522 is an equidigital number, since it uses as much as digits as its factorization.

18309115522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9154557763.

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 18309115522 in words is "eighteen billion, three hundred nine million, one hundred fifteen thousand, five hundred twenty-two".