216502465 has 4 divisors (see below), whose sum is σ = 259802964. Its totient is φ = 173201968.

The previous prime is 216502459. The next prime is 216502477. The reversal of 216502465 is 564205612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 70358544 + 146143921 = 8388^2 + 12089^2 .

It is a cyclic number.

It is not a de Polignac number, because 216502465 - 2⁷ = 216502337 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21650242 + ... + 21650251.

It is an arithmetic number, because the mean of its divisors is an integer number (64950741).

Almost surely, 2^216502465 is an apocalyptic number.

It is an amenable number.

216502465 is a deficient number, since it is larger than the sum of its proper divisors (43300499).

216502465 is an equidigital number, since it uses as much as digits as its factorization.

216502465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43300498.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 216502465 is about 14714.0227334336. The cubic root of 216502465 is about 600.4648850804.

It can be divided in two parts, 216 and 502465, that added together give a square (502681 = 709²).

The spelling of 216502465 in words is "two hundred sixteen million, five hundred two thousand, four hundred sixty-five".