19401166370917 has 2 divisors, whose sum is σ = 19401166370918. Its totient is φ = 19401166370916.

The previous prime is 19401166370819. The next prime is 19401166370921. The reversal of 19401166370917 is 71907366110491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9911125461636 + 9490040909281 = 3148194^2 + 3080591^2 .

It is a cyclic number.

It is not a de Polignac number, because 19401166370917 - 2²³ = 19401157982309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19401166370977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9700583185458 + 9700583185459.

It is an arithmetic number, because the mean of its divisors is an integer number (9700583185459).

Almost surely, 2^{19401166370917} is an apocalyptic number.

It is an amenable number.

19401166370917 is a deficient number, since it is larger than the sum of its proper divisors (1).

19401166370917 is an equidigital number, since it uses as much as digits as its factorization.

19401166370917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 19401166370917 in words is "nineteen trillion, four hundred one billion, one hundred sixty-six million, three hundred seventy thousand, nine hundred seventeen".