66979118 has 4 divisors (see below), whose sum is σ = 100468680. Its totient is φ = 33489558.

The previous prime is 66979109. The next prime is 66979141. The reversal of 66979118 is 81197966.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16744778 + ... + 16744781.

It is an arithmetic number, because the mean of its divisors is an integer number (25117170).

Almost surely, 2^66979118 is an apocalyptic number.

66979118 is a deficient number, since it is larger than the sum of its proper divisors (33489562).

66979118 is a wasteful number, since it uses less digits than its factorization.

66979118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33489561.

The product of its digits is 163296, while the sum is 47.

The square root of 66979118 is about 8184.0771012986. The cubic root of 66979118 is about 406.1126100146.

The spelling of 66979118 in words is "sixty-six million, nine hundred seventy-nine thousand, one hundred eighteen".