66628545693948 has 108 divisors (see below), whose sum is σ = 202675502451240. Its totient is φ = 18380288453184.

The previous prime is 66628545693929. The next prime is 66628545694069. The reversal of 66628545693948 is 84939654582666.

66628545693948 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 651177886 + ... + 651280197.

Almost surely, 2^{66628545693948} is an apocalyptic number.

It is an amenable number.

66628545693948 is an abundant number, since it is smaller than the sum of its proper divisors (136046956757292).

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

66628545693948 is a wasteful number, since it uses less digits than its factorization.

66628545693948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302458136 (or 1302458124 counting only the distinct ones).

The product of its digits is 16124313600, while the sum is 81.

The spelling of 66628545693948 in words is "sixty-six trillion, six hundred twenty-eight billion, five hundred forty-five million, six hundred ninety-three thousand, nine hundred forty-eight".