16538137237 has 4 divisors (see below), whose sum is σ = 16633733580. Its totient is φ = 16442540896.

The previous prime is 16538137193. The next prime is 16538137247. The reversal of 16538137237 is 73273183561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73273183561 = 397 ⋅184567213.

It can be written as a sum of positive squares in 2 ways, for example, as 9822990321 + 6715146916 = 99111^2 + 81946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16538137237 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 (16538137247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47797912 + ... + 47798257.

It is an arithmetic number, because the mean of its divisors is an integer number (4158433395).

Almost surely, 2^16538137237 is an apocalyptic number.

It is an amenable number.

16538137237 is a deficient number, since it is larger than the sum of its proper divisors (95596343).

16538137237 is an equidigital number, since it uses as much as digits as its factorization.

16538137237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95596342.

The product of its digits is 635040, while the sum is 46.

The spelling of 16538137237 in words is "sixteen billion, five hundred thirty-eight million, one hundred thirty-seven thousand, two hundred thirty-seven".