18345837427 has 4 divisors (see below), whose sum is σ = 18346151176. Its totient is φ = 18345523680.

The previous prime is 18345837403. The next prime is 18345837439. The reversal of 18345837427 is 72473854381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72473854381 = 23 ⋅3151037147.

It is a cyclic number.

It is not a de Polignac number, because 18345837427 - 2³¹ = 16198353779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18345837127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40278 + ... + 195739.

It is an arithmetic number, because the mean of its divisors is an integer number (4586537794).

Almost surely, 2^18345837427 is an apocalyptic number.

18345837427 is a deficient number, since it is larger than the sum of its proper divisors (313749).

18345837427 is an equidigital number, since it uses as much as digits as its factorization.

18345837427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313748.

The product of its digits is 4515840, while the sum is 52.

The spelling of 18345837427 in words is "eighteen billion, three hundred forty-five million, eight hundred thirty-seven thousand, four hundred twenty-seven".