19446973414181 has 2 divisors, whose sum is σ = 19446973414182. Its totient is φ = 19446973414180.

The previous prime is 19446973414159. The next prime is 19446973414237. The reversal of 19446973414181 is 18141437964491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15736692302500 + 3710281111681 = 3966950^2 + 1926209^2 .

It is an emirp because it is prime and its reverse (18141437964491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19446973414181 - 2¹⁰ = 19446973413157 is a prime.

It is a super-2 number, since 2×19446973414181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19446973417181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9723486707090 + 9723486707091.

It is an arithmetic number, because the mean of its divisors is an integer number (9723486707091).

Almost surely, 2^{19446973414181} is an apocalyptic number.

It is an amenable number.

19446973414181 is a deficient number, since it is larger than the sum of its proper divisors (1).

19446973414181 is an equidigital number, since it uses as much as digits as its factorization.

19446973414181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 62.

The spelling of 19446973414181 in words is "nineteen trillion, four hundred forty-six billion, nine hundred seventy-three million, four hundred fourteen thousand, one hundred eighty-one".