18887173628212 has 6 divisors (see below), whose sum is σ = 33052553849378. Its totient is φ = 9443586814104.

The previous prime is 18887173628171. The next prime is 18887173628273. The reversal of 18887173628212 is 21282637178881.

It can be written as a sum of positive squares in only one way, i.e., 14693836228516 + 4193337399696 = 3833254^2 + 2047764^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2360896703523 + ... + 2360896703530.

Almost surely, 2^{18887173628212} is an apocalyptic number.

It is an amenable number.

18887173628212 is a deficient number, since it is larger than the sum of its proper divisors (14165380221166).

18887173628212 is a wasteful number, since it uses less digits than its factorization.

18887173628212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4721793407057 (or 4721793407055 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 64.

The spelling of 18887173628212 in words is "eighteen trillion, eight hundred eighty-seven billion, one hundred seventy-three million, six hundred twenty-eight thousand, two hundred twelve".