218871794785 has 16 divisors (see below), whose sum is σ = 304394740992. Its totient is φ = 147969662400.

The previous prime is 218871794723. The next prime is 218871794821. The reversal of 218871794785 is 587497178812.

218871794785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-218871794785 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218871794785.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44036106 + ... + 44041075.

It is an arithmetic number, because the mean of its divisors is an integer number (19024671312).

Almost surely, 2^218871794785 is an apocalyptic number.

It is an amenable number.

218871794785 is a deficient number, since it is larger than the sum of its proper divisors (85522946207).

218871794785 is an equidigital number, since it uses as much as digits as its factorization.

218871794785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88077264.

The product of its digits is 63221760, while the sum is 67.

The spelling of 218871794785 in words is "two hundred eighteen billion, eight hundred seventy-one million, seven hundred ninety-four thousand, seven hundred eighty-five".