216352505 has 8 divisors (see below), whose sum is σ = 266640072. Its totient is φ = 168403968.

The previous prime is 216352459. The next prime is 216352511. The reversal of 216352505 is 505253612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 40551424 + 175801081 = 6368^2 + 13259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216352505 - 2¹⁸ = 216090361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 584552 + ... + 584921.

It is an arithmetic number, because the mean of its divisors is an integer number (33330009).

Almost surely, 2^216352505 is an apocalyptic number.

It is an amenable number.

216352505 is a deficient number, since it is larger than the sum of its proper divisors (50287567).

216352505 is a wasteful number, since it uses less digits than its factorization.

216352505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169515.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 216352505 is about 14708.9260314953. The cubic root of 216352505 is about 600.3262161248.

The spelling of 216352505 in words is "two hundred sixteen million, three hundred fifty-two thousand, five hundred five".