19983669801985 has 8 divisors (see below), whose sum is σ = 24022548587880. Its totient is φ = 15958839291264.

The previous prime is 19983669801983. The next prime is 19983669802013. The reversal of 19983669801985 is 58910896638991.

It can be written as a sum of positive squares in 4 ways, for example, as 302983092721 + 19680686709264 = 550439^2 + 4436292^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19983669801985 - 2¹ = 19983669801983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19983669801899 and 19983669801908.

It is not an unprimeable number, because it can be changed into a prime (19983669801983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3512065662 + ... + 3512071351.

It is an arithmetic number, because the mean of its divisors is an integer number (3002818573485).

Almost surely, 2^{19983669801985} is an apocalyptic number.

It is an amenable number.

19983669801985 is a deficient number, since it is larger than the sum of its proper divisors (4038878785895).

19983669801985 is an equidigital number, since it uses as much as digits as its factorization.

19983669801985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7024137587.

The product of its (nonzero) digits is 1813985280, while the sum is 82.

The spelling of 19983669801985 in words is "nineteen trillion, nine hundred eighty-three billion, six hundred sixty-nine million, eight hundred one thousand, nine hundred eighty-five".