216779065 has 16 divisors (see below), whose sum is σ = 262424448. Its totient is φ = 171905536.

The previous prime is 216779051. The next prime is 216779077. The reversal of 216779065 is 560977612.

It is a cyclic number.

It is not a de Polignac number, because 216779065 - 2⁹ = 216778553 is a prime.

It is a Duffinian number.

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, 463962 + ... + 464428.

It is an arithmetic number, because the mean of its divisors is an integer number (16401528).

Almost surely, 2^216779065 is an apocalyptic number.

It is an amenable number.

216779065 is a deficient number, since it is larger than the sum of its proper divisors (45645383).

216779065 is a wasteful number, since it uses less digits than its factorization.

216779065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 216779065 is about 14723.4189303979. The cubic root of 216779065 is about 600.7204909565.

The spelling of 216779065 in words is "two hundred sixteen million, seven hundred seventy-nine thousand, sixty-five".