66716718 has 16 divisors (see below), whose sum is σ = 135951696. Its totient is φ = 21819200.

The previous prime is 66716711. The next prime is 66716719. The reversal of 66716718 is 81761766.

66716718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66716718² = 8902240921383048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66716718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66716711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104583 + ... + 105218.

It is an arithmetic number, because the mean of its divisors is an integer number (8496981).

Almost surely, 2^66716718 is an apocalyptic number.

66716718 is an abundant number, since it is smaller than the sum of its proper divisors (69234978).

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

66716718 is a wasteful number, since it uses less digits than its factorization.

66716718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209859.

The product of its digits is 84672, while the sum is 42.

The square root of 66716718 is about 8168.0302399048. The cubic root of 66716718 is about 405.5815817607.

The spelling of 66716718 in words is "sixty-six million, seven hundred sixteen thousand, seven hundred eighteen".