216356645 has 8 divisors (see below), whose sum is σ = 262199160. Its totient is φ = 171371200.

The previous prime is 216356641. The next prime is 216356669. The reversal of 216356645 is 546653612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 130553476 + 85803169 = 11426^2 + 9263^2 .

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

It is not a de Polignac number, because 216356645 - 2² = 216356641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216356599 and 216356608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216356641) 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, 213710 + ... + 214719.

It is an arithmetic number, because the mean of its divisors is an integer number (32774895).

Almost surely, 2^216356645 is an apocalyptic number.

It is an amenable number.

216356645 is a deficient number, since it is larger than the sum of its proper divisors (45842515).

216356645 is a wasteful number, since it uses less digits than its factorization.

216356645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428535.

The product of its digits is 129600, while the sum is 38.

The square root of 216356645 is about 14709.0667616950. The cubic root of 216356645 is about 600.3300452688.

The spelling of 216356645 in words is "two hundred sixteen million, three hundred fifty-six thousand, six hundred forty-five".