218431022162855 has 4 divisors (see below), whose sum is σ = 262117226595432. Its totient is φ = 174744817730280.

The previous prime is 218431022162807. The next prime is 218431022162891. The reversal of 218431022162855 is 558261220134812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 218431022162855 - 2¹⁰ = 218431022161831 is a prime.

It is a super-2 number, since 2×218431022162855² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21843102216281 + ... + 21843102216290.

It is an arithmetic number, because the mean of its divisors is an integer number (65529306648858).

Almost surely, 2^{218431022162855} is an apocalyptic number.

218431022162855 is a deficient number, since it is larger than the sum of its proper divisors (43686204432577).

218431022162855 is an equidigital number, since it uses as much as digits as its factorization.

218431022162855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43686204432576.

The product of its (nonzero) digits is 1843200, while the sum is 50.

The spelling of 218431022162855 in words is "two hundred eighteen trillion, four hundred thirty-one billion, twenty-two million, one hundred sixty-two thousand, eight hundred fifty-five".