218939408145 has 24 divisors (see below), whose sum is σ = 380895345792. Its totient is φ = 116336800800.

The previous prime is 218939408089. The next prime is 218939408161. The reversal of 218939408145 is 541804939812.

It is a happy number.

218939408145 is a `hidden beast` number, since 2 + 1 + 8 + 93 + 9 + 408 + 145 = 666.

It is not a de Polignac number, because 218939408145 - 2¹⁵ = 218939375377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218939408091 and 218939408100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8964411 + ... + 8988800.

It is an arithmetic number, because the mean of its divisors is an integer number (15870639408).

Almost surely, 2^218939408145 is an apocalyptic number.

It is an amenable number.

218939408145 is a deficient number, since it is larger than the sum of its proper divisors (161955937647).

218939408145 is a wasteful number, since it uses less digits than its factorization.

218939408145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17953493 (or 17953490 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 218939408145 in words is "two hundred eighteen billion, nine hundred thirty-nine million, four hundred eight thousand, one hundred forty-five".