216724377647 has 2 divisors, whose sum is σ = 216724377648. Its totient is φ = 216724377646.

The previous prime is 216724377599. The next prime is 216724377677. The reversal of 216724377647 is 746773427612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216724377647 - 2²⁸ = 216455942191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216724377592 and 216724377601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216724377677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108362188823 + 108362188824.

It is an arithmetic number, because the mean of its divisors is an integer number (108362188824).

Almost surely, 2^216724377647 is an apocalyptic number.

216724377647 is a deficient number, since it is larger than the sum of its proper divisors (1).

216724377647 is an equidigital number, since it uses as much as digits as its factorization.

216724377647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16595712, while the sum is 56.

The spelling of 216724377647 in words is "two hundred sixteen billion, seven hundred twenty-four million, three hundred seventy-seven thousand, six hundred forty-seven".