216271981284157 has 2 divisors, whose sum is σ = 216271981284158. Its totient is φ = 216271981284156.

The previous prime is 216271981284137. The next prime is 216271981284179. The reversal of 216271981284157 is 751482189172612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138940464864601 + 77331516419556 = 11787301^2 + 8793834^2 .

It is a cyclic number.

It is not a de Polignac number, because 216271981284157 - 2¹¹ = 216271981282109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216271981284137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108135990642078 + 108135990642079.

It is an arithmetic number, because the mean of its divisors is an integer number (108135990642079).

Almost surely, 2^{216271981284157} is an apocalyptic number.

It is an amenable number.

216271981284157 is a deficient number, since it is larger than the sum of its proper divisors (1).

216271981284157 is an equidigital number, since it uses as much as digits as its factorization.

216271981284157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27095040, while the sum is 64.

The spelling of 216271981284157 in words is "two hundred sixteen trillion, two hundred seventy-one billion, nine hundred eighty-one million, two hundred eighty-four thousand, one hundred fifty-seven".