19428185180161 has 8 divisors (see below), whose sum is σ = 19456577331048. Its totient is φ = 19399794960000.

The previous prime is 19428185180119. The next prime is 19428185180233. The reversal of 19428185180161 is 16108158182491.

It can be written as a sum of positive squares in 4 ways, for example, as 9364977050625 + 10063208129536 = 3060225^2 + 3172256^2 .

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 19428185180161 - 2²⁹ = 19427648309249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19428185186161) 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, 20310831 + ... + 21245851.

It is an arithmetic number, because the mean of its divisors is an integer number (2432072166381).

Almost surely, 2^{19428185180161} is an apocalyptic number.

It is an amenable number.

19428185180161 is a deficient number, since it is larger than the sum of its proper divisors (28392150887).

19428185180161 is an equidigital number, since it uses as much as digits as its factorization.

19428185180161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965363.

The product of its (nonzero) digits is 1105920, while the sum is 55.

The spelling of 19428185180161 in words is "nineteen trillion, four hundred twenty-eight billion, one hundred eighty-five million, one hundred eighty thousand, one hundred sixty-one".