218668047 has 16 divisors (see below), whose sum is σ = 321645408. Its totient is φ = 131281920.

The previous prime is 218668027. The next prime is 218668057. The reversal of 218668047 is 740866812.

It is not a de Polignac number, because 218668047 - 2⁸ = 218667791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218668007) 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, 66778 + ... + 69975.

It is an arithmetic number, because the mean of its divisors is an integer number (20102838).

Almost surely, 2^218668047 is an apocalyptic number.

218668047 is a deficient number, since it is larger than the sum of its proper divisors (102977361).

218668047 is a wasteful number, since it uses less digits than its factorization.

218668047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136810.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 218668047 is about 14787.4286811467. The cubic root of 218668047 is about 602.4603115446.

The spelling of 218668047 in words is "two hundred eighteen million, six hundred sixty-eight thousand, forty-seven".