218191422834 has 192 divisors, whose sum is σ = 606126523392. Its totient is φ = 55068854400.

The previous prime is 218191422833. The next prime is 218191422859. The reversal of 218191422834 is 438224191812.

218191422834 is a `hidden beast` number, since 2 + 1 + 8 + 191 + 422 + 8 + 34 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 218191422834.

It is not an unprimeable number, because it can be changed into a prime (218191422833) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 46510429 + ... + 46515119.

It is an arithmetic number, because the mean of its divisors is an integer number (3156908976).

Almost surely, 2^218191422834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218191422834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303063261696).

218191422834 is an abundant number, since it is smaller than the sum of its proper divisors (387935100558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218191422834 is a wasteful number, since it uses less digits than its factorization.

218191422834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661 (or 5658 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The spelling of 218191422834 in words is "two hundred eighteen billion, one hundred ninety-one million, four hundred twenty-two thousand, eight hundred thirty-four".