216903683857 has 12 divisors (see below), whose sum is σ = 252324557796. Its totient is φ = 185911528320.

The previous prime is 216903683833. The next prime is 216903683869. The reversal of 216903683857 is 758386309612.

It can be written as a sum of positive squares in 2 ways, for example, as 95347558656 + 121556125201 = 308784^2 + 348649^2 .

It is not a de Polignac number, because 216903683857 - 2²³ = 216895295249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216903683807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2273557 + ... + 2367037.

It is an arithmetic number, because the mean of its divisors is an integer number (21027046483).

Almost surely, 2^216903683857 is an apocalyptic number.

It is an amenable number.

216903683857 is a deficient number, since it is larger than the sum of its proper divisors (35420873939).

216903683857 is an equidigital number, since it uses as much as digits as its factorization.

216903683857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140848 (or 140841 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 58.

The spelling of 216903683857 in words is "two hundred sixteen billion, nine hundred three million, six hundred eighty-three thousand, eight hundred fifty-seven".