66696763905408 has 128 divisors (see below), whose sum is σ = 218047112881920. Its totient is φ = 17590355306496.

The previous prime is 66696763905259. The next prime is 66696763905439. The reversal of 66696763905408 is 80450936769666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 66696763905408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 954302910 + ... + 954372797.

It is an arithmetic number, because the mean of its divisors is an integer number (1703493069390).

Almost surely, 2^{66696763905408} is an apocalyptic number.

It is an amenable number.

66696763905408 is an abundant number, since it is smaller than the sum of its proper divisors (151350348976512).

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

66696763905408 is a wasteful number, since it uses less digits than its factorization.

66696763905408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908675744 (or 1908675732 counting only the distinct ones).

The product of its (nonzero) digits is 2116316160, while the sum is 75.

The spelling of 66696763905408 in words is "sixty-six trillion, six hundred ninety-six billion, seven hundred sixty-three million, nine hundred five thousand, four hundred eight".