216765109 has 8 divisors (see below), whose sum is σ = 236661120. Its totient is φ = 196900800.

The previous prime is 216765103. The next prime is 216765127. The reversal of 216765109 is 901567612.

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-216765109 is a prime.

It is a super-2 number, since 2×216765109² = 93974224959563762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216765103) 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, 7732 + ... + 22210.

It is an arithmetic number, because the mean of its divisors is an integer number (29582640).

Almost surely, 2^216765109 is an apocalyptic number.

It is an amenable number.

216765109 is a deficient number, since it is larger than the sum of its proper divisors (19896011).

216765109 is a wasteful number, since it uses less digits than its factorization.

216765109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15851.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 216765109 is about 14722.9449839358. The cubic root of 216765109 is about 600.7075994363.

It can be divided in two parts, 2167 and 65109, that added together give a palindrome (67276).

The spelling of 216765109 in words is "two hundred sixteen million, seven hundred sixty-five thousand, one hundred nine".