216540233029 has 2 divisors, whose sum is σ = 216540233030. Its totient is φ = 216540233028.

The previous prime is 216540233009. The next prime is 216540233101. The reversal of 216540233029 is 920332045612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127682584929 + 88857648100 = 357327^2 + 298090^2 .

It is a cyclic number.

It is not a de Polignac number, because 216540233029 - 2¹¹ = 216540230981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216540233009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108270116514 + 108270116515.

It is an arithmetic number, because the mean of its divisors is an integer number (108270116515).

Almost surely, 2^216540233029 is an apocalyptic number.

It is an amenable number.

216540233029 is a deficient number, since it is larger than the sum of its proper divisors (1).

216540233029 is an equidigital number, since it uses as much as digits as its factorization.

216540233029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 216540233029 in words is "two hundred sixteen billion, five hundred forty million, two hundred thirty-three thousand, twenty-nine".