218137816 has 16 divisors (see below), whose sum is σ = 440470800. Its totient is φ = 100678944.

The previous prime is 218137807. The next prime is 218137817. The reversal of 218137816 is 618731812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218137817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048636 + ... + 1048843.

It is an arithmetic number, because the mean of its divisors is an integer number (27529425).

Almost surely, 2^218137816 is an apocalyptic number.

218137816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

218137816 is an abundant number, since it is smaller than the sum of its proper divisors (222332984).

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

218137816 is a wasteful number, since it uses less digits than its factorization.

218137816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097498 (or 2097494 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 218137816 is about 14769.4893615182. The cubic root of 218137816 is about 601.9729645000.

The spelling of 218137816 in words is "two hundred eighteen million, one hundred thirty-seven thousand, eight hundred sixteen".