19729455253 has 8 divisors (see below), whose sum is σ = 19896438240. Its totient is φ = 19562830320.

The previous prime is 19729455217. The next prime is 19729455259. The reversal of 19729455253 is 35255492791.

It is a happy number.

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 19729455253 - 2⁹ = 19729454741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19729455253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19729455259) 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, 21738 + ... + 199828.

It is an arithmetic number, because the mean of its divisors is an integer number (2487054780).

Almost surely, 2^19729455253 is an apocalyptic number.

It is an amenable number.

19729455253 is a deficient number, since it is larger than the sum of its proper divisors (166982987).

19729455253 is a wasteful number, since it uses less digits than its factorization.

19729455253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179027.

The product of its digits is 3402000, while the sum is 52.

The spelling of 19729455253 in words is "nineteen billion, seven hundred twenty-nine million, four hundred fifty-five thousand, two hundred fifty-three".