19443695013 has 6 divisors (see below), whose sum is σ = 28085337254. Its totient is φ = 12962463336.

The previous prime is 19443694981. The next prime is 19443695023. The reversal of 19443695013 is 31059634491.

It can be written as a sum of positive squares in only one way, i.e., 16909881444 + 2533813569 = 130038^2 + 50337^2 .

It is not a de Polignac number, because 19443695013 - 2⁵ = 19443694981 is a prime.

It is a super-2 number, since 2×19443695013² (a number of 21 digits) contains 22 as substring.

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 19443695013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19443695023) 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, 1080205270 + ... + 1080205287.

Almost surely, 2^19443695013 is an apocalyptic number.

It is an amenable number.

19443695013 is a deficient number, since it is larger than the sum of its proper divisors (8641642241).

19443695013 is a wasteful number, since it uses less digits than its factorization.

19443695013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160410563 (or 2160410560 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 19443695013 in words is "nineteen billion, four hundred forty-three million, six hundred ninety-five thousand, thirteen".