18778324242 has 16 divisors (see below), whose sum is σ = 37563088032. Its totient is φ = 6258368160.

The previous prime is 18778324193. The next prime is 18778324259. The reversal of 18778324242 is 24242387781.

It is a happy number.

It is a super-2 number, since 2×18778324242² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18778324191 and 18778324200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229984 + ... + 300747.

It is an arithmetic number, because the mean of its divisors is an integer number (2347693002).

Almost surely, 2^18778324242 is an apocalyptic number.

18778324242 is an abundant number, since it is smaller than the sum of its proper divisors (18784763790).

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

18778324242 is a wasteful number, since it uses less digits than its factorization.

18778324242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536633.

The product of its digits is 1204224, while the sum is 48.

The spelling of 18778324242 in words is "eighteen billion, seven hundred seventy-eight million, three hundred twenty-four thousand, two hundred forty-two".