216553783 has 2 divisors, whose sum is σ = 216553784. Its totient is φ = 216553782.

The previous prime is 216553751. The next prime is 216553787. The reversal of 216553783 is 387355612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216553783 - 2⁵ = 216553751 is a prime.

It is a super-2 number, since 2×216553783² = 93791081863222178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216553787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108276891 + 108276892.

It is an arithmetic number, because the mean of its divisors is an integer number (108276892).

Almost surely, 2^216553783 is an apocalyptic number.

216553783 is a deficient number, since it is larger than the sum of its proper divisors (1).

216553783 is an equidigital number, since it uses as much as digits as its factorization.

216553783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 40.

The square root of 216553783 is about 14715.7664768098. The cubic root of 216553783 is about 600.5123244520.

The spelling of 216553783 in words is "two hundred sixteen million, five hundred fifty-three thousand, seven hundred eighty-three".