20180475444197 has 4 divisors (see below), whose sum is σ = 20876353907820. Its totient is φ = 19484596980576.

The previous prime is 20180475444187. The next prime is 20180475444223. The reversal of 20180475444197 is 79144457408102.

It is a happy number.

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 3161476026916 + 17018999417281 = 1778054^2 + 4125409^2 .

It is a cyclic number.

It is not a de Polignac number, because 20180475444197 - 2¹⁰ = 20180475443173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20180475444187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347939231768 + ... + 347939231825.

It is an arithmetic number, because the mean of its divisors is an integer number (5219088476955).

Almost surely, 2^{20180475444197} is an apocalyptic number.

It is an amenable number.

20180475444197 is a deficient number, since it is larger than the sum of its proper divisors (695878463623).

20180475444197 is an equidigital number, since it uses as much as digits as its factorization.

20180475444197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695878463622.

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 20180475444197 in words is "twenty trillion, one hundred eighty billion, four hundred seventy-five million, four hundred forty-four thousand, one hundred ninety-seven".