18708236081 has 8 divisors (see below), whose sum is σ = 19825381800. Its totient is φ = 17622559360.

The previous prime is 18708236059. The next prime is 18708236149. The reversal of 18708236081 is 18063280781.

It can be written as a sum of positive squares in 4 ways, for example, as 392673856 + 18315562225 = 19816^2 + 135335^2 .

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 18708236081 - 2⁶ = 18708236017 is a prime.

It is a super-2 number, since 2×18708236081² (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 (18708536081) 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, 7866026 + ... + 7868403.

It is an arithmetic number, because the mean of its divisors is an integer number (2478172725).

Almost surely, 2^18708236081 is an apocalyptic number.

It is an amenable number.

18708236081 is a deficient number, since it is larger than the sum of its proper divisors (1117145719).

18708236081 is a wasteful number, since it uses less digits than its factorization.

18708236081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15734499.

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 18708236081 in words is "eighteen billion, seven hundred eight million, two hundred thirty-six thousand, eighty-one".