218320465 has 16 divisors (see below), whose sum is σ = 286623360. Its totient is φ = 158321920.

The previous prime is 218320463. The next prime is 218320483. The reversal of 218320465 is 564023812.

It is not a de Polignac number, because 218320465 - 2¹ = 218320463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218320463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14217 + ... + 25273.

It is an arithmetic number, because the mean of its divisors is an integer number (17913960).

Almost surely, 2^218320465 is an apocalyptic number.

It is an amenable number.

218320465 is a deficient number, since it is larger than the sum of its proper divisors (68302895).

218320465 is a wasteful number, since it uses less digits than its factorization.

218320465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11432.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 218320465 is about 14775.6713891451. The cubic root of 218320465 is about 602.1409303131.

The spelling of 218320465 in words is "two hundred eighteen million, three hundred twenty thousand, four hundred sixty-five".