18005275431749 has 4 divisors (see below), whose sum is σ = 18096672769164. Its totient is φ = 17913878094336.

The previous prime is 18005275431739. The next prime is 18005275431791. The reversal of 18005275431749 is 94713457250081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11043777875524 + 6961497556225 = 3323218^2 + 2638465^2 .

It is a cyclic number.

It is not a de Polignac number, because 18005275431749 - 2⁴ = 18005275431733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18005275431694 and 18005275431703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18005275431709) 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, 45698668412 + ... + 45698668805.

It is an arithmetic number, because the mean of its divisors is an integer number (4524168192291).

Almost surely, 2^{18005275431749} is an apocalyptic number.

It is an amenable number.

18005275431749 is a deficient number, since it is larger than the sum of its proper divisors (91397337415).

18005275431749 is an equidigital number, since it uses as much as digits as its factorization.

18005275431749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91397337414.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 18005275431749 in words is "eighteen trillion, five billion, two hundred seventy-five million, four hundred thirty-one thousand, seven hundred forty-nine".