18818878325 has 12 divisors (see below), whose sum is σ = 25130441028. Its totient is φ = 13897017600.

The previous prime is 18818878303. The next prime is 18818878343. The reversal of 18818878325 is 52387881881.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2424380644 + 16394497681 = 49238^2 + 128041^2 .

It is not a de Polignac number, because 18818878325 - 2¹⁸ = 18818616181 is a prime.

It is a super-2 number, since 2×18818878325² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28951796 + ... + 28952445.

It is an arithmetic number, because the mean of its divisors is an integer number (2094203419).

Almost surely, 2^18818878325 is an apocalyptic number.

It is an amenable number.

18818878325 is a deficient number, since it is larger than the sum of its proper divisors (6311562703).

18818878325 is a wasteful number, since it uses less digits than its factorization.

18818878325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57904264 (or 57904259 counting only the distinct ones).

The product of its digits is 6881280, while the sum is 59.

The spelling of 18818878325 in words is "eighteen billion, eight hundred eighteen million, eight hundred seventy-eight thousand, three hundred twenty-five".