216564701 has 8 divisors (see below), whose sum is σ = 221526744. Its totient is φ = 211648320.

The previous prime is 216564671. The next prime is 216564707. The reversal of 216564701 is 107465612.

It can be written as a sum of positive squares in 4 ways, for example, as 504100 + 216060601 = 710^2 + 14699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216564701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216564707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1730 + ... + 20883.

It is an arithmetic number, because the mean of its divisors is an integer number (27690843).

Almost surely, 2^216564701 is an apocalyptic number.

It is an amenable number.

216564701 is a deficient number, since it is larger than the sum of its proper divisors (4962043).

216564701 is a wasteful number, since it uses less digits than its factorization.

216564701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22831.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 216564701 is about 14716.1374348027. The cubic root of 216564701 is about 600.5224162996.

It can be divided in two parts, 2165 and 64701, that added together give a palindrome (66866).

The spelling of 216564701 in words is "two hundred sixteen million, five hundred sixty-four thousand, seven hundred one".