216536257 has 8 divisors (see below), whose sum is σ = 247568832. Its totient is φ = 185528400.

The previous prime is 216536251. The next prime is 216536279. The reversal of 216536257 is 752635612.

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 216536257 - 2³ = 216536249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216536251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20007 + ... + 28867.

It is an arithmetic number, because the mean of its divisors is an integer number (30946104).

Almost surely, 2^216536257 is an apocalyptic number.

It is an amenable number.

216536257 is a deficient number, since it is larger than the sum of its proper divisors (31032575).

216536257 is an equidigital number, since it uses as much as digits as its factorization.

216536257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12359.

The product of its digits is 75600, while the sum is 37.

The square root of 216536257 is about 14715.1709809978. The cubic root of 216536257 is about 600.4961239146.

The spelling of 216536257 in words is "two hundred sixteen million, five hundred thirty-six thousand, two hundred fifty-seven".