19947224323177 has 2 divisors, whose sum is σ = 19947224323178. Its totient is φ = 19947224323176.

The previous prime is 19947224323171. The next prime is 19947224323211. The reversal of 19947224323177 is 77132342274991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15357158030041 + 4590066293136 = 3918821^2 + 2142444^2 .

It is an emirp because it is prime and its reverse (77132342274991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19947224323177 is a prime.

It is not a weakly prime, because it can be changed into another prime (19947224323171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9973612161588 + 9973612161589.

It is an arithmetic number, because the mean of its divisors is an integer number (9973612161589).

Almost surely, 2^{19947224323177} is an apocalyptic number.

It is an amenable number.

19947224323177 is a deficient number, since it is larger than the sum of its proper divisors (1).

19947224323177 is an equidigital number, since it uses as much as digits as its factorization.

19947224323177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 61.

The spelling of 19947224323177 in words is "nineteen trillion, nine hundred forty-seven billion, two hundred twenty-four million, three hundred twenty-three thousand, one hundred seventy-seven".