219745868651 has 2 divisors, whose sum is σ = 219745868652. Its totient is φ = 219745868650.

The previous prime is 219745868633. The next prime is 219745868687. The reversal of 219745868651 is 156868547912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219745868651 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (219745868621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109872934325 + 109872934326.

It is an arithmetic number, because the mean of its divisors is an integer number (109872934326).

Almost surely, 2^219745868651 is an apocalyptic number.

219745868651 is a deficient number, since it is larger than the sum of its proper divisors (1).

219745868651 is an equidigital number, since it uses as much as digits as its factorization.

219745868651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 62.

The spelling of 219745868651 in words is "two hundred nineteen billion, seven hundred forty-five million, eight hundred sixty-eight thousand, six hundred fifty-one".