218857700066 has 4 divisors (see below), whose sum is σ = 328286550102. Its totient is φ = 109428850032.

The previous prime is 218857700063. The next prime is 218857700119. The reversal of 218857700066 is 660007758812.

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., 216717249841 + 2140450225 = 465529^2 + 46265^2 .

It is a junction number, because it is equal to n+sod(n) for n = 218857699987 and 218857700023.

It is not an unprimeable number, because it can be changed into a prime (218857700063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54714425015 + ... + 54714425018.

Almost surely, 2^218857700066 is an apocalyptic number.

218857700066 is a deficient number, since it is larger than the sum of its proper divisors (109428850036).

218857700066 is a wasteful number, since it uses less digits than its factorization.

218857700066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109428850035.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 218857700066 in words is "two hundred eighteen billion, eight hundred fifty-seven million, seven hundred thousand, sixty-six".