216772065 has 16 divisors (see below), whose sum is σ = 385372800. Its totient is φ = 115611696.

The previous prime is 216772051. The next prime is 216772069. The reversal of 216772065 is 560277612.

It is not a de Polignac number, because 216772065 - 2¹¹ = 216770017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216772069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 802725 + ... + 802994.

It is an arithmetic number, because the mean of its divisors is an integer number (24085800).

Almost surely, 2^216772065 is an apocalyptic number.

It is an amenable number.

216772065 is a deficient number, since it is larger than the sum of its proper divisors (168600735).

216772065 is a wasteful number, since it uses less digits than its factorization.

216772065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605733 (or 1605727 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 216772065 is about 14723.1812119528. The cubic root of 216772065 is about 600.7140249436.

The spelling of 216772065 in words is "two hundred sixteen million, seven hundred seventy-two thousand, sixty-five".