19966293559445 has 4 divisors (see below), whose sum is σ = 23959552271340. Its totient is φ = 15973034847552.

The previous prime is 19966293559313. The next prime is 19966293559453. The reversal of 19966293559445 is 54495539266991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2386335979729 + 17579957579716 = 1544777^2 + 4192846^2 .

It is a cyclic number.

It is not a de Polignac number, because 19966293559445 - 2³² = 19961998592149 is a prime.

It is a super-3 number, since 3×19966293559445³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1996629355940 + ... + 1996629355949.

It is an arithmetic number, because the mean of its divisors is an integer number (5989888067835).

Almost surely, 2^{19966293559445} is an apocalyptic number.

It is an amenable number.

19966293559445 is a deficient number, since it is larger than the sum of its proper divisors (3993258711895).

19966293559445 is an equidigital number, since it uses as much as digits as its factorization.

19966293559445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993258711894.

The product of its digits is 2834352000, while the sum is 77.

The spelling of 19966293559445 in words is "nineteen trillion, nine hundred sixty-six billion, two hundred ninety-three million, five hundred fifty-nine thousand, four hundred forty-five".