18718273208 has 32 divisors (see below), whose sum is σ = 35231016960. Its totient is φ = 9323397600.

The previous prime is 18718273207. The next prime is 18718273229. The reversal of 18718273208 is 80237281781.

It is a super-2 number, since 2×18718273208² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18718273201) 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, 2898383 + ... + 2904833.

It is an arithmetic number, because the mean of its divisors is an integer number (1100969280).

Almost surely, 2^18718273208 is an apocalyptic number.

It is an amenable number.

18718273208 is a deficient number, since it is larger than the sum of its proper divisors (16512743752).

18718273208 is a wasteful number, since it uses less digits than its factorization.

18718273208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787 (or 7783 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 47.

The spelling of 18718273208 in words is "eighteen billion, seven hundred eighteen million, two hundred seventy-three thousand, two hundred eight".