216391203783 has 16 divisors (see below), whose sum is σ = 324537336800. Its totient is φ = 144260801064.

The previous prime is 216391203767. The next prime is 216391203871. The reversal of 216391203783 is 387302193612.

216391203783 is a `hidden beast` number, since 2 + 1 + 639 + 1 + 2 + 0 + 3 + 7 + 8 + 3 = 666.

It is not a de Polignac number, because 216391203783 - 2⁴ = 216391203767 is a prime.

It is a super-2 number, since 2×216391203783² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216391203703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49469968 + ... + 49474341.

It is an arithmetic number, because the mean of its divisors is an integer number (20283583550).

Almost surely, 2^216391203783 is an apocalyptic number.

216391203783 is a deficient number, since it is larger than the sum of its proper divisors (108146133017).

216391203783 is an frugal number, since it uses more digits than its factorization.

216391203783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98944330 (or 98944312 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 216391203783 in words is "two hundred sixteen billion, three hundred ninety-one million, two hundred three thousand, seven hundred eighty-three".