216455465 has 4 divisors (see below), whose sum is σ = 259746564. Its totient is φ = 173164368.

The previous prime is 216455453. The next prime is 216455489. The reversal of 216455465 is 564554612.

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 143113369 + 73342096 = 11963^2 + 8564^2 .

It is a cyclic number.

It is not a de Polignac number, because 216455465 - 2¹⁸ = 216193321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21645542 + ... + 21645551.

It is an arithmetic number, because the mean of its divisors is an integer number (64936641).

Almost surely, 2^216455465 is an apocalyptic number.

It is an amenable number.

216455465 is a deficient number, since it is larger than the sum of its proper divisors (43291099).

216455465 is an equidigital number, since it uses as much as digits as its factorization.

216455465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43291098.

The product of its digits is 144000, while the sum is 38.

The square root of 216455465 is about 14712.4255308226. The cubic root of 216455465 is about 600.4214307761.

The spelling of 216455465 in words is "two hundred sixteen million, four hundred fifty-five thousand, four hundred sixty-five".