18342237637 has 4 divisors (see below), whose sum is σ = 18974728620. Its totient is φ = 17709746656.

The previous prime is 18342237629. The next prime is 18342237659. The reversal of 18342237637 is 73673224381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73673224381 = 113 ⋅651975437.

It can be written as a sum of positive squares in 2 ways, for example, as 10916279361 + 7425958276 = 104481^2 + 86174^2 .

It is a cyclic number.

It is not a de Polignac number, because 18342237637 - 2³ = 18342237629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18342237607) 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, 316245448 + ... + 316245505.

It is an arithmetic number, because the mean of its divisors is an integer number (4743682155).

Almost surely, 2^18342237637 is an apocalyptic number.

It is an amenable number.

18342237637 is a deficient number, since it is larger than the sum of its proper divisors (632490983).

18342237637 is an equidigital number, since it uses as much as digits as its factorization.

18342237637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632490982.

The product of its digits is 1016064, while the sum is 46.

The spelling of 18342237637 in words is "eighteen billion, three hundred forty-two million, two hundred thirty-seven thousand, six hundred thirty-seven".