6638135544 has 32 divisors (see below), whose sum is σ = 18439266000. Its totient is φ = 2212711776.

The previous prime is 6638135533. The next prime is 6638135549. The reversal of 6638135544 is 4455318366.

6638135544 is a `hidden beast` number, since 6 + 638 + 1 + 3 + 5 + 5 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6638135544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638135549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15365839 + ... + 15366270.

Almost surely, 2^6638135544 is an apocalyptic number.

It is an amenable number.

6638135544 is an abundant number, since it is smaller than the sum of its proper divisors (11801130456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6638135544 is a wasteful number, since it uses less digits than its factorization.

6638135544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30732124 (or 30732114 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 6638135544 is about 81474.7540284719. The cubic root of 6638135544 is about 1879.3833370580.

The spelling of 6638135544 in words is "six billion, six hundred thirty-eight million, one hundred thirty-five thousand, five hundred forty-four".