6664538734478 has 16 divisors (see below), whose sum is σ = 10055790377280. Its totient is φ = 3312613196256.

The previous prime is 6664538734409. The next prime is 6664538734493. The reversal of 6664538734478 is 8744378354666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1773851 + ... + 4059017.

It is an arithmetic number, because the mean of its divisors is an integer number (628486898580).

Almost surely, 2^{6664538734478} is an apocalyptic number.

6664538734478 is a deficient number, since it is larger than the sum of its proper divisors (3391251642802).

6664538734478 is a wasteful number, since it uses less digits than its factorization.

6664538734478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293771.

The product of its digits is 1950842880, while the sum is 71.

The spelling of 6664538734478 in words is "six trillion, six hundred sixty-four billion, five hundred thirty-eight million, seven hundred thirty-four thousand, four hundred seventy-eight".