216678801 has 4 divisors (see below), whose sum is σ = 288905072. Its totient is φ = 144452532.

The previous prime is 216678799. The next prime is 216678827. The reversal of 216678801 is 108876612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216678801 - 2¹ = 216678799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216678801.

It is not an unprimeable number, because it can be changed into a prime (216678841) 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, 36113131 + ... + 36113136.

It is an arithmetic number, because the mean of its divisors is an integer number (72226268).

Almost surely, 2^216678801 is an apocalyptic number.

It is an amenable number.

216678801 is a deficient number, since it is larger than the sum of its proper divisors (72226271).

216678801 is an equidigital number, since it uses as much as digits as its factorization.

216678801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72226270.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 216678801 is about 14720.0136209176. The cubic root of 216678801 is about 600.6278621970.

The spelling of 216678801 in words is "two hundred sixteen million, six hundred seventy-eight thousand, eight hundred one".