19973289653 has 4 divisors (see below), whose sum is σ = 20016995340. Its totient is φ = 19929583968.

The previous prime is 19973289617. The next prime is 19973289671. The reversal of 19973289653 is 35698237991.

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 15640753969 + 4332535684 = 125063^2 + 65822^2 .

It is a cyclic number.

It is not a de Polignac number, because 19973289653 - 2¹⁸ = 19973027509 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 (19973289253) 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, 21852158 + ... + 21853071.

It is an arithmetic number, because the mean of its divisors is an integer number (5004248835).

Almost surely, 2^19973289653 is an apocalyptic number.

It is an amenable number.

19973289653 is a deficient number, since it is larger than the sum of its proper divisors (43705687).

19973289653 is an equidigital number, since it uses as much as digits as its factorization.

19973289653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43705686.

The product of its digits is 22044960, while the sum is 62.

The spelling of 19973289653 in words is "nineteen billion, nine hundred seventy-three million, two hundred eighty-nine thousand, six hundred fifty-three".