18755213128 has 8 divisors (see below), whose sum is σ = 35166024630. Its totient is φ = 9377606560.

The previous prime is 18755213117. The next prime is 18755213137. The reversal of 18755213128 is 82131255781.

It can be written as a sum of positive squares in only one way, i.e., 12795681924 + 5959531204 = 113118^2 + 77198^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1172200813 + ... + 1172200828.

Almost surely, 2^18755213128 is an apocalyptic number.

It is an amenable number.

18755213128 is a deficient number, since it is larger than the sum of its proper divisors (16410811502).

18755213128 is a wasteful number, since it uses less digits than its factorization.

18755213128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344401647 (or 2344401643 counting only the distinct ones).

The product of its digits is 134400, while the sum is 43.

The spelling of 18755213128 in words is "eighteen billion, seven hundred fifty-five million, two hundred thirteen thousand, one hundred twenty-eight".