216775145 has 16 divisors (see below), whose sum is σ = 273672000. Its totient is φ = 164595648.

The previous prime is 216775133. The next prime is 216775187. The reversal of 216775145 is 541577612.

It is not a de Polignac number, because 216775145 - 2⁴ = 216775129 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216775099 and 216775108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4115 + ... + 21224.

It is an arithmetic number, because the mean of its divisors is an integer number (17104500).

Almost surely, 2^216775145 is an apocalyptic number.

It is an amenable number.

216775145 is a deficient number, since it is larger than the sum of its proper divisors (56896855).

216775145 is a wasteful number, since it uses less digits than its factorization.

216775145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25432.

The product of its digits is 58800, while the sum is 38.

The square root of 216775145 is about 14723.2858085415. The cubic root of 216775145 is about 600.7168700064.

The spelling of 216775145 in words is "two hundred sixteen million, seven hundred seventy-five thousand, one hundred forty-five".