66539177878 has 8 divisors (see below), whose sum is σ = 100226377440. Its totient is φ = 33130385400.

The previous prime is 66539177833. The next prime is 66539177909. The reversal of 66539177878 is 87877193566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69601173 + ... + 69602128.

It is an arithmetic number, because the mean of its divisors is an integer number (12528297180).

Almost surely, 2^66539177878 is an apocalyptic number.

66539177878 is a deficient number, since it is larger than the sum of its proper divisors (33687199562).

66539177878 is a wasteful number, since it uses less digits than its factorization.

66539177878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139203542.

The product of its digits is 106686720, while the sum is 67.

The spelling of 66539177878 in words is "sixty-six billion, five hundred thirty-nine million, one hundred seventy-seven thousand, eight hundred seventy-eight".