19973569872401 has 4 divisors (see below), whose sum is σ = 20036577979572. Its totient is φ = 19910561765232.

The previous prime is 19973569872383. The next prime is 19973569872409. The reversal of 19973569872401 is 10427896537991.

It is a Cunningham number, because it is equal to 4469180²+1.

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 1118044005376 + 18855525867025 = 1057376^2 + 4342295^2 .

It is a cyclic number.

It is not a de Polignac number, because 19973569872401 - 2¹⁴ = 19973569856017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19973569872409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31504053110 + ... + 31504053743.

It is an arithmetic number, because the mean of its divisors is an integer number (5009144494893).

It is a 1-persistent number, because it is pandigital, but 2⋅19973569872401 = 39947139744802 is not.

Almost surely, 2^{19973569872401} is an apocalyptic number.

It is an amenable number.

19973569872401 is a deficient number, since it is larger than the sum of its proper divisors (63008107171).

19973569872401 is an equidigital number, since it uses as much as digits as its factorization.

19973569872401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63008107170.

The product of its (nonzero) digits is 205752960, while the sum is 71.

The spelling of 19973569872401 in words is "nineteen trillion, nine hundred seventy-three billion, five hundred sixty-nine million, eight hundred seventy-two thousand, four hundred one".