66771756448 has 24 divisors (see below), whose sum is σ = 131538193920. Its totient is φ = 33365231040.

The previous prime is 66771756421. The next prime is 66771756461. The reversal of 66771756448 is 84465717766.

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 3 ways as a sum of consecutive naturals, for example, 592608 + ... + 696223.

It is an arithmetic number, because the mean of its divisors is an integer number (5480758080).

Almost surely, 2^66771756448 is an apocalyptic number.

It is an amenable number.

66771756448 is a deficient number, since it is larger than the sum of its proper divisors (64766437472).

66771756448 is a wasteful number, since it uses less digits than its factorization.

66771756448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290460 (or 1290452 counting only the distinct ones).

The product of its digits is 47416320, while the sum is 61.

The spelling of 66771756448 in words is "sixty-six billion, seven hundred seventy-one million, seven hundred fifty-six thousand, four hundred forty-eight".