19928917253 has 6 divisors (see below), whose sum is σ = 23182618086. Its totient is φ = 17081929032.

The previous prime is 19928917243. The next prime is 19928917259. The reversal of 19928917253 is 35271982991.

It can be written as a sum of positive squares in only one way, i.e., 12347209924 + 7581707329 = 111118^2 + 87073^2 .

It is not a de Polignac number, because 19928917253 - 2⁴ = 19928917237 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 (19928917259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203356250 + ... + 203356347.

It is an arithmetic number, because the mean of its divisors is an integer number (3863769681).

Almost surely, 2^19928917253 is an apocalyptic number.

It is an amenable number.

19928917253 is a deficient number, since it is larger than the sum of its proper divisors (3253700833).

19928917253 is an equidigital number, since it uses as much as digits as its factorization.

19928917253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406712611 (or 406712604 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 56.

The spelling of 19928917253 in words is "nineteen billion, nine hundred twenty-eight million, nine hundred seventeen thousand, two hundred fifty-three".