218405740924 has 48 divisors (see below), whose sum is σ = 461166334720. Its totient is φ = 88412808960.

The previous prime is 218405740919. The next prime is 218405740939. The reversal of 218405740924 is 429047504812.

It is a super-2 number, since 2×218405740924² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429822 + ... + 788389.

Almost surely, 2^218405740924 is an apocalyptic number.

It is an amenable number.

218405740924 is an abundant number, since it is smaller than the sum of its proper divisors (242760593796).

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

218405740924 is a wasteful number, since it uses less digits than its factorization.

218405740924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218578 (or 1218576 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 218405740924 in words is "two hundred eighteen billion, four hundred five million, seven hundred forty thousand, nine hundred twenty-four".