66679578518 has 32 divisors (see below), whose sum is σ = 114755204928. Its totient is φ = 28465344000.

The previous prime is 66679578479. The next prime is 66679578529. The reversal of 66679578518 is 81587597666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3836528 + ... + 3853868.

It is an arithmetic number, because the mean of its divisors is an integer number (3586100154).

Almost surely, 2^66679578518 is an apocalyptic number.

66679578518 is a deficient number, since it is larger than the sum of its proper divisors (48075626410).

66679578518 is a wasteful number, since it uses less digits than its factorization.

66679578518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18408.

The product of its digits is 152409600, while the sum is 68.

The spelling of 66679578518 in words is "sixty-six billion, six hundred seventy-nine million, five hundred seventy-eight thousand, five hundred eighteen".