216251423447 has 2 divisors, whose sum is σ = 216251423448. Its totient is φ = 216251423446.

The previous prime is 216251423441. The next prime is 216251423477. The reversal of 216251423447 is 744324152612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216251423447 - 2³⁶ = 147531946711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216251423441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108125711723 + 108125711724.

It is an arithmetic number, because the mean of its divisors is an integer number (108125711724).

Almost surely, 2^216251423447 is an apocalyptic number.

216251423447 is a deficient number, since it is larger than the sum of its proper divisors (1).

216251423447 is an equidigital number, since it uses as much as digits as its factorization.

216251423447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 41.

The spelling of 216251423447 in words is "two hundred sixteen billion, two hundred fifty-one million, four hundred twenty-three thousand, four hundred forty-seven".