216375779 has 4 divisors (see below), whose sum is σ = 229103784. Its totient is φ = 203647776.

The previous prime is 216375773. The next prime is 216375811. The reversal of 216375779 is 977573612.

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

It is a cyclic number.

It is not a de Polignac number, because 216375779 - 2¹⁶ = 216310243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216375773) 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, 6363977 + ... + 6364010.

It is an arithmetic number, because the mean of its divisors is an integer number (57275946).

Almost surely, 2^216375779 is an apocalyptic number.

216375779 is a deficient number, since it is larger than the sum of its proper divisors (12728005).

216375779 is a wasteful number, since it uses less digits than its factorization.

216375779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12728004.

The product of its digits is 555660, while the sum is 47.

The square root of 216375779 is about 14709.7171624746. The cubic root of 216375779 is about 600.3477419388.

The spelling of 216375779 in words is "two hundred sixteen million, three hundred seventy-five thousand, seven hundred seventy-nine".