642064646506 has 16 divisors (see below), whose sum is σ = 1019775711816. Its totient is φ = 302140371456.

The previous prime is 642064646501. The next prime is 642064646537. The reversal of 642064646506 is 605646460246.

It can be written as a sum of positive squares in 4 ways, for example, as 491436050625 + 150628595881 = 701025^2 + 388109^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642064646506.

It is not an unprimeable number, because it can be changed into a prime (642064646501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1246990 + ... + 1684966.

Almost surely, 2^642064646506 is an apocalyptic number.

642064646506 is a deficient number, since it is larger than the sum of its proper divisors (377711065310).

642064646506 is a wasteful number, since it uses less digits than its factorization.

642064646506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481113.

The product of its (nonzero) digits is 4976640, while the sum is 49.

The spelling of 642064646506 in words is "six hundred forty-two billion, sixty-four million, six hundred forty-six thousand, five hundred six".