66384768177 has 24 divisors (see below), whose sum is σ = 118017367104. Its totient is φ = 35016141024.

The previous prime is 66384768161. The next prime is 66384768223. The reversal of 66384768177 is 77186748366.

It is a happy number.

66384768177 is a `hidden beast` number, since 66 + 38 + 476 + 8 + 1 + 77 = 666.

It is not a de Polignac number, because 66384768177 - 2⁴ = 66384768161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (66384766177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40527123 + ... + 40528760.

It is an arithmetic number, because the mean of its divisors is an integer number (4917390296).

Almost surely, 2^66384768177 is an apocalyptic number.

It is an amenable number.

66384768177 is a deficient number, since it is larger than the sum of its proper divisors (51632598927).

66384768177 is a wasteful number, since it uses less digits than its factorization.

66384768177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81055909 (or 81055906 counting only the distinct ones).

The product of its digits is 56899584, while the sum is 63.

The spelling of 66384768177 in words is "sixty-six billion, three hundred eighty-four million, seven hundred sixty-eight thousand, one hundred seventy-seven".