66686572176144 has 40 divisors (see below), whose sum is σ = 172280226127680. Its totient is φ = 22228008187008.

The previous prime is 66686572176131. The next prime is 66686572176149. The reversal of 66686572176144 is 44167127568666.

It is not an unprimeable number, because it can be changed into a prime (66686572176149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25267492 + ... + 27781635.

It is an arithmetic number, because the mean of its divisors is an integer number (4307005653192).

Almost surely, 2^{66686572176144} is an apocalyptic number.

It is an amenable number.

66686572176144 is an abundant number, since it is smaller than the sum of its proper divisors (105593653951536).

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

66686572176144 is a wasteful number, since it uses less digits than its factorization.

66686572176144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53075327 (or 53075321 counting only the distinct ones).

The product of its digits is 487710720, while the sum is 69.

The spelling of 66686572176144 in words is "sixty-six trillion, six hundred eighty-six billion, five hundred seventy-two million, one hundred seventy-six thousand, one hundred forty-four".