218426678505 has 96 divisors (see below), whose sum is σ = 441620315136. Its totient is φ = 97798551552.

The previous prime is 218426678501. The next prime is 218426678531. The reversal of 218426678505 is 505876624812.

218426678505 is a `hidden beast` number, since 2 + 1 + 8 + 4 + 2 + 66 + 78 + 505 = 666.

It is not a de Polignac number, because 218426678505 - 2² = 218426678501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218426678501) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 9889104 + ... + 9911166.

It is an arithmetic number, because the mean of its divisors is an integer number (4600211616).

Almost surely, 2^218426678505 is an apocalyptic number.

It is an amenable number.

218426678505 is an abundant number, since it is smaller than the sum of its proper divisors (223193636631).

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

218426678505 is a wasteful number, since it uses less digits than its factorization.

218426678505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22727 (or 22724 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 218426678505 in words is "two hundred eighteen billion, four hundred twenty-six million, six hundred seventy-eight thousand, five hundred five".