18138626531005 has 8 divisors (see below), whose sum is σ = 21772271454552. Its totient is φ = 14506954813248.

The previous prime is 18138626530919. The next prime is 18138626531009. The reversal of 18138626531005 is 50013562683181.

It can be written as a sum of positive squares in 4 ways, for example, as 1040748869241 + 17097877661764 = 1020171^2 + 4134958^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18138626531005 is a prime.

It is a super-3 number, since 3×18138626531005³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18138626531005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138626531009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493281222 + ... + 493317991.

It is an arithmetic number, because the mean of its divisors is an integer number (2721533931819).

Almost surely, 2^{18138626531005} is an apocalyptic number.

It is an amenable number.

18138626531005 is a deficient number, since it is larger than the sum of its proper divisors (3633644923547).

18138626531005 is an equidigital number, since it uses as much as digits as its factorization.

18138626531005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986602895.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 18138626531005 in words is "eighteen trillion, one hundred thirty-eight billion, six hundred twenty-six million, five hundred thirty-one thousand, five".