218803851 has 24 divisors (see below), whose sum is σ = 365780480. Its totient is φ = 123445296.

The previous prime is 218803817. The next prime is 218803891. The reversal of 218803851 is 158308812.

218803851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218803851 - 2¹⁸ = 218541707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218803891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17005 + ... + 26958.

Almost surely, 2^218803851 is an apocalyptic number.

218803851 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

218803851 is a deficient number, since it is larger than the sum of its proper divisors (146976629).

218803851 is a wasteful number, since it uses less digits than its factorization.

218803851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44055 (or 44052 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 218803851 is about 14792.0198417931. The cubic root of 218803851 is about 602.5850052523.

The spelling of 218803851 in words is "two hundred eighteen million, eight hundred three thousand, eight hundred fifty-one".