218042634981 has 8 divisors (see below), whose sum is σ = 291652343680. Its totient is φ = 144897341472.

The previous prime is 218042634959. The next prime is 218042634989. The reversal of 218042634981 is 189436240812.

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

It is not a de Polignac number, because 218042634981 - 2¹⁷ = 218042503909 is a prime.

It is a super-2 number, since 2×218042634981² (a number of 23 digits) contains 22 as substring.

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 218042634981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218042634989) 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, 116102701 + ... + 116104578.

It is an arithmetic number, because the mean of its divisors is an integer number (36456542960).

Almost surely, 2^218042634981 is an apocalyptic number.

It is an amenable number.

218042634981 is a deficient number, since it is larger than the sum of its proper divisors (73609708699).

218042634981 is a wasteful number, since it uses less digits than its factorization.

218042634981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232207595.

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 218042634981 in words is "two hundred eighteen billion, forty-two million, six hundred thirty-four thousand, nine hundred eighty-one".