218668071 has 4 divisors (see below), whose sum is σ = 291557432. Its totient is φ = 145778712.

The previous prime is 218668067. The next prime is 218668081. The reversal of 218668071 is 170866812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 218668071 - 2² = 218668067 is a prime.

It is a super-2 number, since 2×218668071² = 95631450549722082, which 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 (218668081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36444676 + ... + 36444681.

It is an arithmetic number, because the mean of its divisors is an integer number (72889358).

Almost surely, 2^218668071 is an apocalyptic number.

218668071 is a deficient number, since it is larger than the sum of its proper divisors (72889361).

218668071 is an equidigital number, since it uses as much as digits as its factorization.

218668071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72889360.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 218668071 is about 14787.4294926468. The cubic root of 218668071 is about 602.4603335857.

The spelling of 218668071 in words is "two hundred eighteen million, six hundred sixty-eight thousand, seventy-one".