10638537181 has 4 divisors (see below), whose sum is σ = 10638756700. Its totient is φ = 10638317664.

The previous prime is 10638537113. The next prime is 10638537227. The reversal of 10638537181 is 18173583601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18173583601 = 19577 ⋅928313.

It can be written as a sum of positive squares in 2 ways, for example, as 3639708900 + 6998828281 = 60330^2 + 83659^2 .

It is a cyclic number.

It is not a de Polignac number, because 10638537181 - 2¹⁵ = 10638504413 is a prime.

It is a super-2 number, since 2×10638537181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10638537881) 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, 1416 + ... + 145873.

It is an arithmetic number, because the mean of its divisors is an integer number (2659689175).

Almost surely, 2^10638537181 is an apocalyptic number.

It is an amenable number.

10638537181 is a deficient number, since it is larger than the sum of its proper divisors (219519).

10638537181 is an equidigital number, since it uses as much as digits as its factorization.

10638537181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219518.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 10638537181 in words is "ten billion, six hundred thirty-eight million, five hundred thirty-seven thousand, one hundred eighty-one".