216665742933 has 6 divisors (see below), whose sum is σ = 312961628694. Its totient is φ = 144443828616.

The previous prime is 216665742913. The next prime is 216665742961. The reversal of 216665742933 is 339247566612.

216665742933 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 208138513284 + 8527229649 = 456222^2 + 92343^2 .

It is not a de Polignac number, because 216665742933 - 2¹⁰ = 216665741909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216665742933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216665742913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12036985710 + ... + 12036985727.

It is an arithmetic number, because the mean of its divisors is an integer number (52160271449).

Almost surely, 2^216665742933 is an apocalyptic number.

It is an amenable number.

216665742933 is a deficient number, since it is larger than the sum of its proper divisors (96295885761).

216665742933 is a wasteful number, since it uses less digits than its factorization.

216665742933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24073971443 (or 24073971440 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 54.

The spelling of 216665742933 in words is "two hundred sixteen billion, six hundred sixty-five million, seven hundred forty-two thousand, nine hundred thirty-three".