216780853 has 4 divisors (see below), whose sum is σ = 216827820. Its totient is φ = 216733888.

The previous prime is 216780833. The next prime is 216780857. The reversal of 216780853 is 358087612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129208689 + 87572164 = 11367^2 + 9358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216780853 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 (216780857) 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, 15700 + ... + 26077.

It is an arithmetic number, because the mean of its divisors is an integer number (54206955).

Almost surely, 2^216780853 is an apocalyptic number.

It is an amenable number.

216780853 is a deficient number, since it is larger than the sum of its proper divisors (46967).

216780853 is an equidigital number, since it uses as much as digits as its factorization.

216780853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46966.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 216780853 is about 14723.4796498654. The cubic root of 216780853 is about 600.7221425386.

The spelling of 216780853 in words is "two hundred sixteen million, seven hundred eighty thousand, eight hundred fifty-three".