6638479636040 has 128 divisors (see below), whose sum is σ = 18146529273600. Its totient is φ = 2133629952000.

The previous prime is 6638479636027. The next prime is 6638479636051. The reversal of 6638479636040 is 406369748366.

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 31 ways as a sum of consecutive naturals, for example, 1583405 + ... + 3972924.

It is an arithmetic number, because the mean of its divisors is an integer number (141769759950).

Almost surely, 2^{6638479636040} is an apocalyptic number.

It is an amenable number.

6638479636040 is an abundant number, since it is smaller than the sum of its proper divisors (11508049637560).

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

6638479636040 is a wasteful number, since it uses less digits than its factorization.

6638479636040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556615 (or 5556611 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 62.

The spelling of 6638479636040 in words is "six trillion, six hundred thirty-eight billion, four hundred seventy-nine million, six hundred thirty-six thousand, forty".