216776447 has 2 divisors, whose sum is σ = 216776448. Its totient is φ = 216776446.

The previous prime is 216776437. The next prime is 216776467. The reversal of 216776447 is 744677612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216776447 - 2⁶ = 216776383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216776398 and 216776407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216776407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108388223 + 108388224.

It is an arithmetic number, because the mean of its divisors is an integer number (108388224).

Almost surely, 2^216776447 is an apocalyptic number.

216776447 is a deficient number, since it is larger than the sum of its proper divisors (1).

216776447 is an equidigital number, since it uses as much as digits as its factorization.

216776447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 44.

The square root of 216776447 is about 14723.3300241487. The cubic root of 216776447 is about 600.7180726839.

The spelling of 216776447 in words is "two hundred sixteen million, seven hundred seventy-six thousand, four hundred forty-seven".