18739107818 has 8 divisors (see below), whose sum is σ = 28109286660. Its totient is φ = 9369345600.

The previous prime is 18739107817. The next prime is 18739107853. The reversal of 18739107818 is 81870193781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14260419889 + 4478687929 = 119417^2 + 66923^2 .

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

It is a super-2 number, since 2×18739107818² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18739107818.

It is not an unprimeable number, because it can be changed into a prime (18739107817) 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, 60098 + ... + 202706.

Almost surely, 2^18739107818 is an apocalyptic number.

18739107818 is a deficient number, since it is larger than the sum of its proper divisors (9370178842).

18739107818 is a wasteful number, since it uses less digits than its factorization.

18739107818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208312.

The product of its (nonzero) digits is 677376, while the sum is 53.

The spelling of 18739107818 in words is "eighteen billion, seven hundred thirty-nine million, one hundred seven thousand, eight hundred eighteen".