19903040453 has 4 divisors (see below), whose sum is σ = 20545074048. Its totient is φ = 19261006860.

The previous prime is 19903040447. The next prime is 19903040467. The reversal of 19903040453 is 35404030991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19903040453 is a prime.

It is a super-2 number, since 2×19903040453² (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 (19903040153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321016751 + ... + 321016812.

It is an arithmetic number, because the mean of its divisors is an integer number (5136268512).

Almost surely, 2^19903040453 is an apocalyptic number.

It is an amenable number.

19903040453 is a deficient number, since it is larger than the sum of its proper divisors (642033595).

19903040453 is an equidigital number, since it uses as much as digits as its factorization.

19903040453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642033594.

The product of its (nonzero) digits is 58320, while the sum is 38.

The spelling of 19903040453 in words is "nineteen billion, nine hundred three million, forty thousand, four hundred fifty-three".