216779853 has 16 divisors (see below), whose sum is σ = 301948416. Its totient is φ = 138079920.

The previous prime is 216779831. The next prime is 216779867. The reversal of 216779853 is 358977612.

It is not a de Polignac number, because 216779853 - 2⁵ = 216779821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216779153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111298 + ... + 113228.

It is an arithmetic number, because the mean of its divisors is an integer number (18871776).

Almost surely, 2^216779853 is an apocalyptic number.

216779853 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

216779853 is a deficient number, since it is larger than the sum of its proper divisors (85168563).

216779853 is a wasteful number, since it uses less digits than its factorization.

216779853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584.

The product of its digits is 635040, while the sum is 48.

The square root of 216779853 is about 14723.4456904625. The cubic root of 216779853 is about 600.7212188361.

The spelling of 216779853 in words is "two hundred sixteen million, seven hundred seventy-nine thousand, eight hundred fifty-three".