218650081 has 8 divisors (see below), whose sum is σ = 247862720. Its totient is φ = 191207952.

The previous prime is 218650079. The next prime is 218650093. The reversal of 218650081 is 180056812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218650081 - 2¹ = 218650079 is a prime.

It is a super-2 number, since 2×218650081² = 95615715842613122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218650001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442365 + ... + 442858.

It is an arithmetic number, because the mean of its divisors is an integer number (30982840).

Almost surely, 2^218650081 is an apocalyptic number.

It is an amenable number.

218650081 is a deficient number, since it is larger than the sum of its proper divisors (29212639).

218650081 is a wasteful number, since it uses less digits than its factorization.

218650081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885255.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 218650081 is about 14786.8211932112. The cubic root of 218650081 is about 602.4438114988.

The spelling of 218650081 in words is "two hundred eighteen million, six hundred fifty thousand, eighty-one".