218207671388 has 12 divisors (see below), whose sum is σ = 436415342832. Its totient is φ = 93517573440.

The previous prime is 218207671277. The next prime is 218207671391. The reversal of 218207671388 is 883176702812.

218207671388 is an admirable number.

It is a super-2 number, since 2×218207671388² (a number of 23 digits) contains 22 as substring.

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, 3896565533 + ... + 3896565588.

It is an arithmetic number, because the mean of its divisors is an integer number (36367945236).

Almost surely, 2^218207671388 is an apocalyptic number.

218207671388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

218207671388 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

218207671388 is a wasteful number, since it uses less digits than its factorization.

218207671388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7793131132 (or 7793131130 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 218207671388 in words is "two hundred eighteen billion, two hundred seven million, six hundred seventy-one thousand, three hundred eighty-eight".