642536635246 has 24 divisors (see below), whose sum is σ = 1059503243400. Its totient is φ = 292030588080.

The previous prime is 642536635229. The next prime is 642536635249.

642536635246 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 642536635193 and 642536635202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642536635249) 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 11 ways as a sum of consecutive naturals, for example, 2181580 + ... + 2458528.

It is an arithmetic number, because the mean of its divisors is an integer number (44145968475).

Almost surely, 2^642536635246 is an apocalyptic number.

642536635246 is a deficient number, since it is larger than the sum of its proper divisors (416966608154).

642536635246 is a wasteful number, since it uses less digits than its factorization.

642536635246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286560 (or 286549 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 52.

The spelling of 642536635246 in words is "six hundred forty-two billion, five hundred thirty-six million, six hundred thirty-five thousand, two hundred forty-six".