218001645887013 has 6 divisors (see below), whose sum is σ = 314891266281254. Its totient is φ = 145334430591336.

The previous prime is 218001645886979. The next prime is 218001645887071. The reversal of 218001645887013 is 310788546100812.

218001645887013 is a `hidden beast` number, since 2 + 180 + 0 + 1 + 6 + 458 + 8 + 7 + 0 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 163968076220004 + 54033569667009 = 12805002^2 + 7350753^2 .

It is not a de Polignac number, because 218001645887013 - 2²¹ = 218001643789861 is a prime.

It is a super-2 number, since 2×218001645887013² (a number of 29 digits) 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 (218001645887083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12111202549270 + ... + 12111202549287.

Almost surely, 2^{218001645887013} is an apocalyptic number.

It is an amenable number.

218001645887013 is a deficient number, since it is larger than the sum of its proper divisors (96889620394241).

218001645887013 is a wasteful number, since it uses less digits than its factorization.

218001645887013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24222405098563 (or 24222405098560 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 218001645887013 in words is "two hundred eighteen trillion, one billion, six hundred forty-five million, eight hundred eighty-seven thousand, thirteen".