19973603585 has 32 divisors (see below), whose sum is σ = 26467287840. Its totient is φ = 14378876928.

The previous prime is 19973603513. The next prime is 19973603591. The reversal of 19973603585 is 58530637991.

It is a Cunningham number, because it is equal to 141328²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 5148349504 + 14825254081 = 71752^2 + 121759^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19973603585 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19973603585.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 522401 + ... + 559329.

It is an arithmetic number, because the mean of its divisors is an integer number (827102745).

Almost surely, 2^19973603585 is an apocalyptic number.

It is an amenable number.

19973603585 is a deficient number, since it is larger than the sum of its proper divisors (6493684255).

19973603585 is a wasteful number, since it uses less digits than its factorization.

19973603585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37157.

The product of its (nonzero) digits is 6123600, while the sum is 56.

The spelling of 19973603585 in words is "nineteen billion, nine hundred seventy-three million, six hundred three thousand, five hundred eighty-five".