643040635142 has 4 divisors (see below), whose sum is σ = 964560952716. Its totient is φ = 321520317570.

The previous prime is 643040635129. The next prime is 643040635151. The reversal of 643040635142 is 241536040346.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 643040635096 and 643040635105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160760158784 + ... + 160760158787.

It is an arithmetic number, because the mean of its divisors is an integer number (241140238179).

Almost surely, 2^643040635142 is an apocalyptic number.

643040635142 is a deficient number, since it is larger than the sum of its proper divisors (321520317574).

643040635142 is a wasteful number, since it uses less digits than its factorization.

643040635142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321520317573.

The product of its (nonzero) digits is 207360, while the sum is 38.

Adding to 643040635142 its reverse (241536040346), we get a palindrome (884576675488).

The spelling of 643040635142 in words is "six hundred forty-three billion, forty million, six hundred thirty-five thousand, one hundred forty-two".