218939378146 has 16 divisors (see below), whose sum is σ = 329846463360. Its totient is φ = 108991092240.

The previous prime is 218939378117. The next prime is 218939378233. The reversal of 218939378146 is 641873939812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690775 + ... + 956581.

It is an arithmetic number, because the mean of its divisors is an integer number (20615403960).

Almost surely, 2^218939378146 is an apocalyptic number.

218939378146 is a deficient number, since it is larger than the sum of its proper divisors (110907085214).

218939378146 is a wasteful number, since it uses less digits than its factorization.

218939378146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267609.

The product of its digits is 15676416, while the sum is 61.

The spelling of 218939378146 in words is "two hundred eighteen billion, nine hundred thirty-nine million, three hundred seventy-eight thousand, one hundred forty-six".