216666741 has 4 divisors (see below), whose sum is σ = 288888992. Its totient is φ = 144444492.

The previous prime is 216666731. The next prime is 216666797. The reversal of 216666741 is 147666612.

216666741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216666741 - 2¹⁹ = 216142453 is a prime.

It is a super-2 number, since 2×216666741² = 93888953311122162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216666741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216666731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36111121 + ... + 36111126.

It is an arithmetic number, because the mean of its divisors is an integer number (72222248).

Almost surely, 2^216666741 is an apocalyptic number.

It is an amenable number.

216666741 is a deficient number, since it is larger than the sum of its proper divisors (72222251).

216666741 is an equidigital number, since it uses as much as digits as its factorization.

216666741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72222250.

The product of its digits is 72576, while the sum is 39.

The square root of 216666741 is about 14719.6039688573. The cubic root of 216666741 is about 600.6167186574.

The spelling of 216666741 in words is "two hundred sixteen million, six hundred sixty-six thousand, seven hundred forty-one".