218690653980 has 96 divisors (see below), whose sum is σ = 644876064000. Its totient is φ = 55221239808.

The previous prime is 218690653901. The next prime is 218690653991. The reversal of 218690653980 is 89356096812.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 218690653980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2347164 + ... + 2438556.

It is an arithmetic number, because the mean of its divisors is an integer number (6717459000).

Almost surely, 2^218690653980 is an apocalyptic number.

218690653980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218690653980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322438032000).

218690653980 is an abundant number, since it is smaller than the sum of its proper divisors (426185410020).

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

218690653980 is a wasteful number, since it uses less digits than its factorization.

218690653980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93523 (or 93521 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 57.

The spelling of 218690653980 in words is "two hundred eighteen billion, six hundred ninety million, six hundred fifty-three thousand, nine hundred eighty".