18173045137 has 4 divisors (see below), whose sum is σ = 19570971700. Its totient is φ = 16775118576.

The previous prime is 18173045113. The next prime is 18173045161. The reversal of 18173045137 is 73154037181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73154037181 = 31 ⋅2359807651.

It is an interprime number because it is at equal distance from previous prime (18173045113) and next prime (18173045161).

It can be written as a sum of positive squares in 2 ways, for example, as 1044517761 + 17128527376 = 32319^2 + 130876^2 .

It is a cyclic number.

It is not a de Polignac number, because 18173045137 - 2²⁷ = 18038827409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18173045137.

It is not an unprimeable number, because it can be changed into a prime (18173045167) 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, 698963262 + ... + 698963287.

It is an arithmetic number, because the mean of its divisors is an integer number (4892742925).

Almost surely, 2^18173045137 is an apocalyptic number.

It is an amenable number.

18173045137 is a deficient number, since it is larger than the sum of its proper divisors (1397926563).

18173045137 is a wasteful number, since it uses less digits than its factorization.

18173045137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397926562.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 18173045137 in words is "eighteen billion, one hundred seventy-three million, forty-five thousand, one hundred thirty-seven".