6635533121428 has 24 divisors (see below), whose sum is σ = 11684528855552. Its totient is φ = 3297100158144.

The previous prime is 6635533121423. The next prime is 6635533121429. The reversal of 6635533121428 is 8241213355366.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6635533121423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6491776 + ... + 7444072.

Almost surely, 2^{6635533121428} is an apocalyptic number.

It is an amenable number.

6635533121428 is a deficient number, since it is larger than the sum of its proper divisors (5048995734124).

6635533121428 is a wasteful number, since it uses less digits than its factorization.

6635533121428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963151 (or 963149 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 49.

The spelling of 6635533121428 in words is "six trillion, six hundred thirty-five billion, five hundred thirty-three million, one hundred twenty-one thousand, four hundred twenty-eight".