66759718 has 4 divisors (see below), whose sum is σ = 100139580. Its totient is φ = 33379858.

The previous prime is 66759703. The next prime is 66759727. The reversal of 66759718 is 81795766.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 16689928 + ... + 16689931.

It is an arithmetic number, because the mean of its divisors is an integer number (25034895).

Almost surely, 2^66759718 is an apocalyptic number.

66759718 is a deficient number, since it is larger than the sum of its proper divisors (33379862).

66759718 is a wasteful number, since it uses less digits than its factorization.

66759718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33379861.

The product of its digits is 635040, while the sum is 49.

The square root of 66759718 is about 8170.6620294808. The cubic root of 66759718 is about 405.6686976696.

The spelling of 66759718 in words is "sixty-six million, seven hundred fifty-nine thousand, seven hundred eighteen".