19717355137 has 2 divisors, whose sum is σ = 19717355138. Its totient is φ = 19717355136.

The previous prime is 19717355083. The next prime is 19717355143. The reversal of 19717355137 is 73155371791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18496272001 + 1221083136 = 136001^2 + 34944^2 .

It is a cyclic number.

It is not a de Polignac number, because 19717355137 - 2¹⁹ = 19716830849 is a prime.

It is not a weakly prime, because it can be changed into another prime (19717355737) 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, 9858677568 + 9858677569.

It is an arithmetic number, because the mean of its divisors is an integer number (9858677569).

Almost surely, 2^19717355137 is an apocalyptic number.

It is an amenable number.

19717355137 is a deficient number, since it is larger than the sum of its proper divisors (1).

19717355137 is an equidigital number, since it uses as much as digits as its factorization.

19717355137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 694575, while the sum is 49.

The spelling of 19717355137 in words is "nineteen billion, seven hundred seventeen million, three hundred fifty-five thousand, one hundred thirty-seven".