19445272319 has 32 divisors (see below), whose sum is σ = 22165954560. Its totient is φ = 16898392800.

The previous prime is 19445272313. The next prime is 19445272393. The reversal of 19445272319 is 91327254491.

It is a cyclic number.

It is not a de Polignac number, because 19445272319 - 2¹² = 19445268223 is a prime.

It is a super-2 number, since 2×19445272319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19445272313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19082192 + ... + 19083210.

It is an arithmetic number, because the mean of its divisors is an integer number (692686080).

Almost surely, 2^19445272319 is an apocalyptic number.

19445272319 is a deficient number, since it is larger than the sum of its proper divisors (2720682241).

19445272319 is a wasteful number, since it uses less digits than its factorization.

19445272319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

The product of its digits is 544320, while the sum is 47.

The spelling of 19445272319 in words is "nineteen billion, four hundred forty-five million, two hundred seventy-two thousand, three hundred nineteen".