66678285134544 has 80 divisors (see below), whose sum is σ = 178627647604800. Its totient is φ = 21407209141248.

The previous prime is 66678285134533. The next prime is 66678285134551. The reversal of 66678285134544 is 44543158287666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57989434 + ... + 59128089.

It is an arithmetic number, because the mean of its divisors is an integer number (2232845595060).

Almost surely, 2^{66678285134544} is an apocalyptic number.

It is an amenable number.

66678285134544 is an abundant number, since it is smaller than the sum of its proper divisors (111949362470256).

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

66678285134544 is a wasteful number, since it uses less digits than its factorization.

66678285134544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117117972 (or 117117966 counting only the distinct ones).

The product of its digits is 928972800, while the sum is 69.

The spelling of 66678285134544 in words is "sixty-six trillion, six hundred seventy-eight billion, two hundred eighty-five million, one hundred thirty-four thousand, five hundred forty-four".