18082172029 has 4 divisors (see below), whose sum is σ = 18130650076. Its totient is φ = 18033693984.

The previous prime is 18082172027. The next prime is 18082172033. The reversal of 18082172029 is 92027128081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92027128081 = 7 ⋅13146732583.

It can be written as a sum of positive squares in 2 ways, for example, as 8688104100 + 9394067929 = 93210^2 + 96923^2 .

It is a cyclic number.

It is not a de Polignac number, because 18082172029 - 2¹ = 18082172027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18082171982 and 18082172000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18082172027) 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, 24238464 + ... + 24239209.

It is an arithmetic number, because the mean of its divisors is an integer number (4532662519).

Almost surely, 2^18082172029 is an apocalyptic number.

It is an amenable number.

18082172029 is a deficient number, since it is larger than the sum of its proper divisors (48478047).

18082172029 is an equidigital number, since it uses as much as digits as its factorization.

18082172029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48478046.

The product of its (nonzero) digits is 32256, while the sum is 40.

The spelling of 18082172029 in words is "eighteen billion, eighty-two million, one hundred seventy-two thousand, twenty-nine".