218406213948 has 96 divisors (see below), whose sum is σ = 591791235840. Its totient is φ = 62112130560.

The previous prime is 218406213919. The next prime is 218406214003. The reversal of 218406213948 is 849312604812.

It is a junction number, because it is equal to n+sod(n) for n = 218406213897 and 218406213906.

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, 777090 + ... + 1020137.

It is an arithmetic number, because the mean of its divisors is an integer number (6164492040).

Almost surely, 2^218406213948 is an apocalyptic number.

It is an amenable number.

218406213948 is an abundant number, since it is smaller than the sum of its proper divisors (373385021892).

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

218406213948 is a wasteful number, since it uses less digits than its factorization.

218406213948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797307 (or 1797305 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 218406213948 in words is "two hundred eighteen billion, four hundred six million, two hundred thirteen thousand, nine hundred forty-eight".