218128549706 has 4 divisors (see below), whose sum is σ = 327192824562. Its totient is φ = 109064274852.

The previous prime is 218128549687. The next prime is 218128549721. The reversal of 218128549706 is 607945821812.

218128549706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 218080594081 + 47955625 = 466991^2 + 6925^2 .

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, 54532137425 + ... + 54532137428.

Almost surely, 2^218128549706 is an apocalyptic number.

218128549706 is a deficient number, since it is larger than the sum of its proper divisors (109064274856).

218128549706 is a wasteful number, since it uses less digits than its factorization.

218128549706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109064274855.

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 218128549706 in words is "two hundred eighteen billion, one hundred twenty-eight million, five hundred forty-nine thousand, seven hundred six".