19669880805121 has 4 divisors (see below), whose sum is σ = 19676435250244. Its totient is φ = 19663326360000.

The previous prime is 19669880805103. The next prime is 19669880805247. The reversal of 19669880805121 is 12150808896691.

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 9844289028721 + 9825591776400 = 3137561^2 + 3134580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19669880805121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19669880809121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3277218060 + ... + 3277224061.

It is an arithmetic number, because the mean of its divisors is an integer number (4919108812561).

Almost surely, 2^{19669880805121} is an apocalyptic number.

It is an amenable number.

19669880805121 is a deficient number, since it is larger than the sum of its proper divisors (6554445123).

19669880805121 is an equidigital number, since it uses as much as digits as its factorization.

19669880805121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6554445122.

The product of its (nonzero) digits is 14929920, while the sum is 64.

The spelling of 19669880805121 in words is "nineteen trillion, six hundred sixty-nine billion, eight hundred eighty million, eight hundred five thousand, one hundred twenty-one".