19448873897 has 8 divisors (see below), whose sum is σ = 19670852520. Its totient is φ = 19226972160.

The previous prime is 19448873891. The next prime is 19448873903. The reversal of 19448873897 is 79837884491.

It is an interprime number because it is at equal distance from previous prime (19448873891) and next prime (19448873903).

It can be written as a sum of positive squares in 4 ways, for example, as 8551810576 + 10897063321 = 92476^2 + 104389^2 .

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 19448873897 - 2⁴ = 19448873881 is a prime.

It is a super-2 number, since 2×19448873897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19448873891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603833 + ... + 635225.

It is an arithmetic number, because the mean of its divisors is an integer number (2458856565).

Almost surely, 2^19448873897 is an apocalyptic number.

It is an amenable number.

19448873897 is a deficient number, since it is larger than the sum of its proper divisors (221978623).

19448873897 is an equidigital number, since it uses as much as digits as its factorization.

19448873897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38443.

The product of its digits is 97542144, while the sum is 68.

The spelling of 19448873897 in words is "nineteen billion, four hundred forty-eight million, eight hundred seventy-three thousand, eight hundred ninety-seven".