218347867064647 has 16 divisors (see below), whose sum is σ = 222006231012384. Its totient is φ = 214721843760000.

The previous prime is 218347867064611. The next prime is 218347867064653. The reversal of 218347867064647 is 746460768743812.

It is a cyclic number.

It is not a de Polignac number, because 218347867064647 - 2¹¹ = 218347867062599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218347867064647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218347867064147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7076872 + ... + 22063042.

It is an arithmetic number, because the mean of its divisors is an integer number (13875389438274).

Almost surely, 2^{218347867064647} is an apocalyptic number.

218347867064647 is a deficient number, since it is larger than the sum of its proper divisors (3658363947737).

218347867064647 is a wasteful number, since it uses less digits than its factorization.

218347867064647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14987250.

The product of its (nonzero) digits is 1820786688, while the sum is 73.

The spelling of 218347867064647 in words is "two hundred eighteen trillion, three hundred forty-seven billion, eight hundred sixty-seven million, sixty-four thousand, six hundred forty-seven".