643123645606004 has 24 divisors (see below), whose sum is σ = 1125769403358600. Its totient is φ = 321475250073600.

The previous prime is 643123645605971. The next prime is 643123645606007. The reversal of 643123645606004 is 400606546321346.

It can be written as a sum of positive squares in 4 ways, for example, as 173127174528400 + 469996471077604 = 13157780^2 + 21679402^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643123645606007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485007104 + ... + 486331304.

It is an arithmetic number, because the mean of its divisors is an integer number (46907058473275).

Almost surely, 2^{643123645606004} is an apocalyptic number.

It is an amenable number.

643123645606004 is a deficient number, since it is larger than the sum of its proper divisors (482645757752596).

643123645606004 is a wasteful number, since it uses less digits than its factorization.

643123645606004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356803 (or 1356801 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 50.

The spelling of 643123645606004 in words is "six hundred forty-three trillion, one hundred twenty-three billion, six hundred forty-five million, six hundred six thousand, four".