216635057 has 2 divisors, whose sum is σ = 216635058. Its totient is φ = 216635056.

The previous prime is 216635039. The next prime is 216635077. The reversal of 216635057 is 750536612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191794801 + 24840256 = 13849^2 + 4984^2 .

It is a cyclic number.

It is not a de Polignac number, because 216635057 - 2¹⁴ = 216618673 is a prime.

It is not a weakly prime, because it can be changed into another prime (216635077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108317528 + 108317529.

It is an arithmetic number, because the mean of its divisors is an integer number (108317529).

Almost surely, 2^216635057 is an apocalyptic number.

It is an amenable number.

216635057 is a deficient number, since it is larger than the sum of its proper divisors (1).

216635057 is an equidigital number, since it uses as much as digits as its factorization.

216635057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 216635057 is about 14718.5276777265. The cubic root of 216635057 is about 600.5874404093.

The spelling of 216635057 in words is "two hundred sixteen million, six hundred thirty-five thousand, fifty-seven".