646536136432 has 20 divisors (see below), whose sum is σ = 1253855674936. Its totient is φ = 322960478400.

The previous prime is 646536136403. The next prime is 646536136481. The reversal of 646536136432 is 234631635646.

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, 19207023 + ... + 19240654.

Almost surely, 2^646536136432 is an apocalyptic number.

It is an amenable number.

646536136432 is a deficient number, since it is larger than the sum of its proper divisors (607319538504).

646536136432 is a wasteful number, since it uses less digits than its factorization.

646536136432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38448736 (or 38448730 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 49.

The spelling of 646536136432 in words is "six hundred forty-six billion, five hundred thirty-six million, one hundred thirty-six thousand, four hundred thirty-two".