218561551050 has 96 divisors (see below), whose sum is σ = 559826365248. Its totient is φ = 56399915520.

The previous prime is 218561551037. The next prime is 218561551193. The reversal of 218561551050 is 50155165812.

It is a super-2 number, since 2×218561551050² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 392049 + ... + 768651.

It is an arithmetic number, because the mean of its divisors is an integer number (5831524638).

Almost surely, 2^218561551050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218561551050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279913182624).

218561551050 is an abundant number, since it is smaller than the sum of its proper divisors (341264814198).

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

218561551050 is a wasteful number, since it uses less digits than its factorization.

218561551050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376744 (or 376739 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 39.

The spelling of 218561551050 in words is "two hundred eighteen billion, five hundred sixty-one million, five hundred fifty-one thousand, fifty".