218776368874642 has 4 divisors (see below), whose sum is σ = 328164553311966. Its totient is φ = 109388184437320.

The previous prime is 218776368874627. The next prime is 218776368874673. The reversal of 218776368874642 is 246478863677812.

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., 192097687324761 + 26678681549881 = 13859931^2 + 5165141^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54694092218659 + ... + 54694092218662.

Almost surely, 2^{218776368874642} is an apocalyptic number.

218776368874642 is a deficient number, since it is larger than the sum of its proper divisors (109388184437324).

218776368874642 is a wasteful number, since it uses less digits than its factorization.

218776368874642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109388184437323.

The product of its digits is 7283146752, while the sum is 79.

The spelling of 218776368874642 in words is "two hundred eighteen trillion, seven hundred seventy-six billion, three hundred sixty-eight million, eight hundred seventy-four thousand, six hundred forty-two".