218979849605 has 8 divisors (see below), whose sum is σ = 286664530464. Its totient is φ = 159258072400.

The previous prime is 218979849593. The next prime is 218979849619. The reversal of 218979849605 is 506948979812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218979849605 - 2⁴ = 218979849589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 1990725851 + ... + 1990725960.

It is an arithmetic number, because the mean of its divisors is an integer number (35833066308).

Almost surely, 2^218979849605 is an apocalyptic number.

It is an amenable number.

218979849605 is a deficient number, since it is larger than the sum of its proper divisors (67684680859).

218979849605 is a wasteful number, since it uses less digits than its factorization.

218979849605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3981451827.

The product of its (nonzero) digits is 78382080, while the sum is 68.

The spelling of 218979849605 in words is "two hundred eighteen billion, nine hundred seventy-nine million, eight hundred forty-nine thousand, six hundred five".