18426846169 has 4 divisors (see below), whose sum is σ = 18485718196. Its totient is φ = 18367974144.

The previous prime is 18426846161. The next prime is 18426846173. The reversal of 18426846169 is 96164862481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96164862481 = 463 ⋅207699487.

It can be written as a sum of positive squares in 2 ways, for example, as 8767887769 + 9658958400 = 93637^2 + 98280^2 .

It is a cyclic number.

It is not a de Polignac number, because 18426846169 - 2³ = 18426846161 is a prime.

It is a super-2 number, since 2×18426846169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18426846161) 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, 29435544 + ... + 29436169.

It is an arithmetic number, because the mean of its divisors is an integer number (4621429549).

Almost surely, 2^18426846169 is an apocalyptic number.

It is an amenable number.

18426846169 is a deficient number, since it is larger than the sum of its proper divisors (58872027).

18426846169 is an equidigital number, since it uses as much as digits as its factorization.

18426846169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58872026.

The product of its digits is 3981312, while the sum is 55.

The spelling of 18426846169 in words is "eighteen billion, four hundred twenty-six million, eight hundred forty-six thousand, one hundred sixty-nine".