18142473637 has 4 divisors (see below), whose sum is σ = 18584973036. Its totient is φ = 17699974240.

The previous prime is 18142473617. The next prime is 18142473647. The reversal of 18142473637 is 73637424181.

It is a Cunningham number, because it is equal to 134694²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73637424181 = 6113 ⋅12046037.

It can be written as a sum of positive squares in 2 ways, for example, as 874148356 + 17268325281 = 29566^2 + 131409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18142473637 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 (18142473607) 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, 221249638 + ... + 221249719.

It is an arithmetic number, because the mean of its divisors is an integer number (4646243259).

Almost surely, 2^18142473637 is an apocalyptic number.

It is an amenable number.

18142473637 is a deficient number, since it is larger than the sum of its proper divisors (442499399).

18142473637 is an equidigital number, since it uses as much as digits as its factorization.

18142473637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442499398.

The product of its digits is 677376, while the sum is 46.

The spelling of 18142473637 in words is "eighteen billion, one hundred forty-two million, four hundred seventy-three thousand, six hundred thirty-seven".