643125563442 has 24 divisors (see below), whose sum is σ = 1394427731580. Its totient is φ = 214223032320.

The previous prime is 643125563441. The next prime is 643125563467. The reversal of 643125563442 is 244365521346.

643125563442 is a `hidden beast` number, since 6 + 4 + 3 + 1 + 2 + 5 + 5 + 634 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 602764351641 + 40361211801 = 776379^2 + 200901^2 .

It is a super-2 number, since 2×643125563442² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643125563441) 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, 12653559 + ... + 12704282.

Almost surely, 2^643125563442 is an apocalyptic number.

643125563442 is an abundant number, since it is smaller than the sum of its proper divisors (751302168138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643125563442 is a wasteful number, since it uses less digits than its factorization.

643125563442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25359258 (or 25359255 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 45.

The spelling of 643125563442 in words is "six hundred forty-three billion, one hundred twenty-five million, five hundred sixty-three thousand, four hundred forty-two".