216256847537 has 8 divisors (see below), whose sum is σ = 224566084680. Its totient is φ = 208092119040.

The previous prime is 216256847533. The next prime is 216256847549. The reversal of 216256847537 is 735748652612.

It can be written as a sum of positive squares in 4 ways, for example, as 9508395121 + 206748452416 = 97511^2 + 454696^2 .

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 216256847537 - 2² = 216256847533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216256847533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36124112 + ... + 36130097.

It is an arithmetic number, because the mean of its divisors is an integer number (28070760585).

Almost surely, 2^216256847537 is an apocalyptic number.

It is an amenable number.

216256847537 is a deficient number, since it is larger than the sum of its proper divisors (8309237143).

216256847537 is an equidigital number, since it uses as much as digits as its factorization.

216256847537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72254323.

The product of its digits is 16934400, while the sum is 56.

The spelling of 216256847537 in words is "two hundred sixteen billion, two hundred fifty-six million, eight hundred forty-seven thousand, five hundred thirty-seven".