216455345 has 8 divisors (see below), whose sum is σ = 259869480. Its totient is φ = 173082240.

The previous prime is 216455341. The next prime is 216455363. The reversal of 216455345 is 543554612.

It can be written as a sum of positive squares in 4 ways, for example, as 2155024 + 214300321 = 1468^2 + 14639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216455345 - 2² = 216455341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216455341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2885 + ... + 21005.

It is an arithmetic number, because the mean of its divisors is an integer number (32483685).

Almost surely, 2^216455345 is an apocalyptic number.

It is an amenable number.

216455345 is a deficient number, since it is larger than the sum of its proper divisors (43414135).

216455345 is a wasteful number, since it uses less digits than its factorization.

216455345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20515.

The product of its digits is 72000, while the sum is 35.

The square root of 216455345 is about 14712.4214526365. The cubic root of 216455345 is about 600.4213198208.

The spelling of 216455345 in words is "two hundred sixteen million, four hundred fifty-five thousand, three hundred forty-five".