218458064220431 has 16 divisors (see below), whose sum is σ = 259573033009920. Its totient is φ = 179956094281920.

The previous prime is 218458064220413. The next prime is 218458064220439. The reversal of 218458064220431 is 134022460854812.

It is a cyclic number.

It is not a de Polignac number, because 218458064220431 - 2¹⁸ = 218458063958287 is a prime.

It is a super-2 number, since 2×218458064220431² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 218458064220431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218458064220439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5680413041 + ... + 5680451498.

It is an arithmetic number, because the mean of its divisors is an integer number (16223314563120).

Almost surely, 2^{218458064220431} is an apocalyptic number.

218458064220431 is a deficient number, since it is larger than the sum of its proper divisors (41114968789489).

218458064220431 is a wasteful number, since it uses less digits than its factorization.

218458064220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11360864654.

The product of its (nonzero) digits is 2949120, while the sum is 50.

The spelling of 218458064220431 in words is "two hundred eighteen trillion, four hundred fifty-eight billion, sixty-four million, two hundred twenty thousand, four hundred thirty-one".