218650661711 has 4 divisors (see below), whose sum is σ = 218767401792. Its totient is φ = 218533921632.

The previous prime is 218650661689. The next prime is 218650661767. The reversal of 218650661711 is 117166056812.

218650661711 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218650661711 is a prime.

It is a super-2 number, since 2×218650661711² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218650661111) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 58367231 + ... + 58370976.

It is an arithmetic number, because the mean of its divisors is an integer number (54691850448).

Almost surely, 2^218650661711 is an apocalyptic number.

218650661711 is a deficient number, since it is larger than the sum of its proper divisors (116740081).

218650661711 is a wasteful number, since it uses less digits than its factorization.

218650661711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116740080.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 218650661711 in words is "two hundred eighteen billion, six hundred fifty million, six hundred sixty-one thousand, seven hundred eleven".