66404864628 has 36 divisors (see below), whose sum is σ = 167970985728. Its totient is φ = 22119889680.

The previous prime is 66404864609. The next prime is 66404864629. The reversal of 66404864628 is 82646840466.

66404864628 is a `hidden beast` number, since 6 + 6 + 4 + 0 + 4 + 8 + 6 + 4 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66404864629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574026 + ... + 679937.

Almost surely, 2^66404864628 is an apocalyptic number.

It is an amenable number.

66404864628 is an abundant number, since it is smaller than the sum of its proper divisors (101566121100).

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

66404864628 is a wasteful number, since it uses less digits than its factorization.

66404864628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255444 (or 1255439 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 54.

The spelling of 66404864628 in words is "sixty-six billion, four hundred four million, eight hundred sixty-four thousand, six hundred twenty-eight".