66078643548 has 24 divisors (see below), whose sum is σ = 154188548752. Its totient is φ = 22025493504.

The previous prime is 66078643529. The next prime is 66078643549. The reversal of 66078643548 is 84534687066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66078643549) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 397086 + ... + 538362.

Almost surely, 2^66078643548 is an apocalyptic number.

It is an amenable number.

66078643548 is an abundant number, since it is smaller than the sum of its proper divisors (88109905204).

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

66078643548 is a wasteful number, since it uses less digits than its factorization.

66078643548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180261 (or 180259 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 57.

The spelling of 66078643548 in words is "sixty-six billion, seventy-eight million, six hundred forty-three thousand, five hundred forty-eight".