218492013851 has 4 divisors (see below), whose sum is σ = 231344485272. Its totient is φ = 205639542432.

The previous prime is 218492013847. The next prime is 218492013881. The reversal of 218492013851 is 158310294812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218492013851 - 2² = 218492013847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218492013881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6426235685 + ... + 6426235718.

It is an arithmetic number, because the mean of its divisors is an integer number (57836121318).

Almost surely, 2^218492013851 is an apocalyptic number.

218492013851 is a deficient number, since it is larger than the sum of its proper divisors (12852471421).

218492013851 is a wasteful number, since it uses less digits than its factorization.

218492013851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12852471420.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 218492013851 in words is "two hundred eighteen billion, four hundred ninety-two million, thirteen thousand, eight hundred fifty-one".