216430985651 has 2 divisors, whose sum is σ = 216430985652. Its totient is φ = 216430985650.

The previous prime is 216430985647. The next prime is 216430985677. The reversal of 216430985651 is 156589034612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216430985651 - 2² = 216430985647 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216430985651.

It is not a weakly prime, because it can be changed into another prime (216430981651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108215492825 + 108215492826.

It is an arithmetic number, because the mean of its divisors is an integer number (108215492826).

Almost surely, 2^216430985651 is an apocalyptic number.

216430985651 is a deficient number, since it is larger than the sum of its proper divisors (1).

216430985651 is an equidigital number, since it uses as much as digits as its factorization.

216430985651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 216430985651 in words is "two hundred sixteen billion, four hundred thirty million, nine hundred eighty-five thousand, six hundred fifty-one".