18036263081 has 8 divisors (see below), whose sum is σ = 18313013544. Its totient is φ = 17760314880.

The previous prime is 18036263039. The next prime is 18036263083.

18036263081 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 2190400 + 18034072681 = 1480^2 + 134291^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18036263081 - 2⁶ = 18036263017 is a prime.

It is a super-2 number, since 2×18036263081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18036263083) 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, 155180 + ... + 245261.

It is an arithmetic number, because the mean of its divisors is an integer number (2289126693).

Almost surely, 2^18036263081 is an apocalyptic number.

It is an amenable number.

18036263081 is a deficient number, since it is larger than the sum of its proper divisors (276750463).

18036263081 is an equidigital number, since it uses as much as digits as its factorization.

18036263081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401131.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 18036263081 in words is "eighteen billion, thirty-six million, two hundred sixty-three thousand, eighty-one".