19643730453 has 12 divisors (see below), whose sum is σ = 28422133740. Its totient is φ = 13073732736.

The previous prime is 19643730443. The next prime is 19643730473. The reversal of 19643730453 is 35403734691.

19643730453 is a `hidden beast` number, since 1 + 96 + 43 + 73 + 0 + 453 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4818719889 + 14825010564 = 69417^2 + 121758^2 .

It is not a de Polignac number, because 19643730453 - 2²⁵ = 19610176021 is a prime.

It is a super-2 number, since 2×19643730453² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19643730399 and 19643730408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19643730443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1834998 + ... + 1845671.

It is an arithmetic number, because the mean of its divisors is an integer number (2368511145).

Almost surely, 2^19643730453 is an apocalyptic number.

It is an amenable number.

19643730453 is a deficient number, since it is larger than the sum of its proper divisors (8778403287).

19643730453 is a wasteful number, since it uses less digits than its factorization.

19643730453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681268 (or 3681265 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 45.

The spelling of 19643730453 in words is "nineteen billion, six hundred forty-three million, seven hundred thirty thousand, four hundred fifty-three".