66918576138 has 8 divisors (see below), whose sum is σ = 133837152288. Its totient is φ = 22306192044.

The previous prime is 66918576073. The next prime is 66918576143. The reversal of 66918576138 is 83167581966.

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

66918576138 is an admirable 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, 5576548006 + ... + 5576548017.

It is an arithmetic number, because the mean of its divisors is an integer number (16729644036).

Almost surely, 2^66918576138 is an apocalyptic number.

66918576138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66918576138 is a wasteful number, since it uses less digits than its factorization.

66918576138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11153096028.

The product of its digits is 13063680, while the sum is 60.

The spelling of 66918576138 in words is "sixty-six billion, nine hundred eighteen million, five hundred seventy-six thousand, one hundred thirty-eight".