643125563441 has 2 divisors, whose sum is σ = 643125563442. Its totient is φ = 643125563440.

The previous prime is 643125563407. The next prime is 643125563467. The reversal of 643125563441 is 144365521346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617161075216 + 25964488225 = 785596^2 + 161135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643125563441 is a prime.

It is a super-2 number, since 2×643125563441² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643125563392 and 643125563401.

It is not a weakly prime, because it can be changed into another prime (643125563471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321562781720 + 321562781721.

It is an arithmetic number, because the mean of its divisors is an integer number (321562781721).

Almost surely, 2^643125563441 is an apocalyptic number.

It is an amenable number.

643125563441 is a deficient number, since it is larger than the sum of its proper divisors (1).

643125563441 is an equidigital number, since it uses as much as digits as its factorization.

643125563441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 44.

The spelling of 643125563441 in words is "six hundred forty-three billion, one hundred twenty-five million, five hundred sixty-three thousand, four hundred forty-one".