19747233071897 has 2 divisors, whose sum is σ = 19747233071898. Its totient is φ = 19747233071896.

The previous prime is 19747233071887. The next prime is 19747233071983. The reversal of 19747233071897 is 79817033274791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13310742295321 + 6436490776576 = 3648389^2 + 2537024^2 .

It is a cyclic number.

It is not a de Polignac number, because 19747233071897 - 2¹² = 19747233067801 is a prime.

It is not a weakly prime, because it can be changed into another prime (19747233071837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9873616535948 + 9873616535949.

It is an arithmetic number, because the mean of its divisors is an integer number (9873616535949).

Almost surely, 2^{19747233071897} is an apocalyptic number.

It is an amenable number.

19747233071897 is a deficient number, since it is larger than the sum of its proper divisors (1).

19747233071897 is an equidigital number, since it uses as much as digits as its factorization.

19747233071897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112021056, while the sum is 68.

The spelling of 19747233071897 in words is "nineteen trillion, seven hundred forty-seven billion, two hundred thirty-three million, seventy-one thousand, eight hundred ninety-seven".