643125563453 has 4 divisors (see below), whose sum is σ = 643132579200. Its totient is φ = 643118547708.

The previous prime is 643125563441. The next prime is 643125563467. The reversal of 643125563453 is 354365521346.

643125563453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 354365521346 = 2 ⋅177182760673.

It is a cyclic number.

It is not a de Polignac number, because 643125563453 - 2⁶ = 643125563389 is a prime.

It is a super-2 number, since 2×643125563453² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643125563398 and 643125563407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643125163453) 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, 3368525 + ... + 3554322.

It is an arithmetic number, because the mean of its divisors is an integer number (160783144800).

Almost surely, 2^643125563453 is an apocalyptic number.

It is an amenable number.

643125563453 is a deficient number, since it is larger than the sum of its proper divisors (7015747).

643125563453 is an equidigital number, since it uses as much as digits as its factorization.

643125563453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7015746.

The product of its digits is 3888000, while the sum is 47.

The spelling of 643125563453 in words is "six hundred forty-three billion, one hundred twenty-five million, five hundred sixty-three thousand, four hundred fifty-three".