218890903193 has 4 divisors (see below), whose sum is σ = 228407899008. Its totient is φ = 209373907380.

The previous prime is 218890903183. The next prime is 218890903201. The reversal of 218890903193 is 391309098812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218890903193 - 2³⁰ = 217817161369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218890903163) 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, 4758497873 + ... + 4758497918.

It is an arithmetic number, because the mean of its divisors is an integer number (57101974752).

Almost surely, 2^218890903193 is an apocalyptic number.

218890903193 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

218890903193 is a deficient number, since it is larger than the sum of its proper divisors (9516995815).

218890903193 is an equidigital number, since it uses as much as digits as its factorization.

218890903193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9516995814.

The product of its (nonzero) digits is 839808, while the sum is 53.

The spelling of 218890903193 in words is "two hundred eighteen billion, eight hundred ninety million, nine hundred three thousand, one hundred ninety-three".