646142355536 has 20 divisors (see below), whose sum is σ = 1252569265332. Its totient is φ = 322898674176.

The previous prime is 646142355517. The next prime is 646142355641. The reversal of 646142355536 is 635553241646.

It can be written as a sum of positive squares in 2 ways, for example, as 288605328400 + 357537027136 = 537220^2 + 597944^2 .

It is a super-2 number, since 2×646142355536² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10750571 + ... + 10810506.

Almost surely, 2^646142355536 is an apocalyptic number.

It is an amenable number.

646142355536 is a deficient number, since it is larger than the sum of its proper divisors (606426909796).

646142355536 is a wasteful number, since it uses less digits than its factorization.

646142355536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21562958 (or 21562952 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 50.

The spelling of 646142355536 in words is "six hundred forty-six billion, one hundred forty-two million, three hundred fifty-five thousand, five hundred thirty-six".