218475020399 has 4 divisors (see below), whose sum is σ = 218566320336. Its totient is φ = 218383720464.

The previous prime is 218475020381. The next prime is 218475020437. The reversal of 218475020399 is 993020574812.

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 218475020399 - 2¹² = 218475016303 is a prime.

It is a super-2 number, since 2×218475020399² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218475020359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45646379 + ... + 45651164.

It is an arithmetic number, because the mean of its divisors is an integer number (54641580084).

Almost surely, 2^218475020399 is an apocalyptic number.

218475020399 is a deficient number, since it is larger than the sum of its proper divisors (91299937).

218475020399 is an equidigital number, since it uses as much as digits as its factorization.

218475020399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91299936.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 218475020399 in words is "two hundred eighteen billion, four hundred seventy-five million, twenty thousand, three hundred ninety-nine".