18778181224 has 16 divisors (see below), whose sum is σ = 38409916320. Its totient is φ = 8535536880.

The previous prime is 18778181189. The next prime is 18778181243. The reversal of 18778181224 is 42218187781.

It is a super-2 number, since 2×18778181224² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106694124 + ... + 106694299.

It is an arithmetic number, because the mean of its divisors is an integer number (2400619770).

Almost surely, 2^18778181224 is an apocalyptic number.

It is an amenable number.

18778181224 is an abundant number, since it is smaller than the sum of its proper divisors (19631735096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18778181224 is a wasteful number, since it uses less digits than its factorization.

18778181224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213388440 (or 213388436 counting only the distinct ones).

The product of its digits is 401408, while the sum is 49.

It can be divided in two parts, 18778 and 181224, that added together give a palindrome (200002).

The spelling of 18778181224 in words is "eighteen billion, seven hundred seventy-eight million, one hundred eighty-one thousand, two hundred twenty-four".