218013654561 has 8 divisors (see below), whose sum is σ = 291163762944. Its totient is φ = 145102991280.

The previous prime is 218013654517. The next prime is 218013654589. The reversal of 218013654561 is 165456310812.

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

It is not a de Polignac number, because 218013654561 - 2¹¹ = 218013652513 is a prime.

It is a super-2 number, since 2×218013654561² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218013654961) 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, 59859150 + ... + 59862791.

It is an arithmetic number, because the mean of its divisors is an integer number (36395470368).

Almost surely, 2^218013654561 is an apocalyptic number.

It is an amenable number.

218013654561 is a deficient number, since it is larger than the sum of its proper divisors (73150108383).

218013654561 is a wasteful number, since it uses less digits than its factorization.

218013654561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119722551.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 218013654561 in words is "two hundred eighteen billion, thirteen million, six hundred fifty-four thousand, five hundred sixty-one".