218738399346 has 176 divisors, whose sum is σ = 525740984640. Its totient is φ = 68052791520.

The previous prime is 218738399291. The next prime is 218738399371. The reversal of 218738399346 is 643993837812.

218738399346 is a `hidden beast` number, since 2 + 187 + 38 + 399 + 34 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 87 ways as a sum of consecutive naturals, for example, 159313516 + ... + 159314888.

Almost surely, 2^218738399346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218738399346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262870492320).

218738399346 is an abundant number, since it is smaller than the sum of its proper divisors (307002585294).

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

218738399346 is an equidigital number, since it uses as much as digits as its factorization.

218738399346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495 (or 1468 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 63.

The spelling of 218738399346 in words is "two hundred eighteen billion, seven hundred thirty-eight million, three hundred ninety-nine thousand, three hundred forty-six".