216377765 has 16 divisors (see below), whose sum is σ = 263098368. Its totient is φ = 170818176.

The previous prime is 216377743. The next prime is 216377789. The reversal of 216377765 is 567773612.

It is a cyclic number.

It is not a de Polignac number, because 216377765 - 2¹⁴ = 216361381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196697 + ... + 197793.

It is an arithmetic number, because the mean of its divisors is an integer number (16443648).

Almost surely, 2^216377765 is an apocalyptic number.

It is an amenable number.

216377765 is a deficient number, since it is larger than the sum of its proper divisors (46720603).

216377765 is a wasteful number, since it uses less digits than its factorization.

216377765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588.

The product of its digits is 370440, while the sum is 44.

The square root of 216377765 is about 14709.7846687163. The cubic root of 216377765 is about 600.3495786924.

The spelling of 216377765 in words is "two hundred sixteen million, three hundred seventy-seven thousand, seven hundred sixty-five".