66911716 has 6 divisors (see below), whose sum is σ = 117095510. Its totient is φ = 33455856.

The previous prime is 66911699. The next prime is 66911737. The reversal of 66911716 is 61711966.

It can be written as a sum of positive squares in only one way, i.e., 34762816 + 32148900 = 5896^2 + 5670^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8363961 + ... + 8363968.

Almost surely, 2^66911716 is an apocalyptic number.

It is an amenable number.

66911716 is a deficient number, since it is larger than the sum of its proper divisors (50183794).

66911716 is a wasteful number, since it uses less digits than its factorization.

66911716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16727933 (or 16727931 counting only the distinct ones).

The product of its digits is 13608, while the sum is 37.

The square root of 66911716 is about 8179.9581906022. The cubic root of 66911716 is about 405.9763387409.

The spelling of 66911716 in words is "sixty-six million, nine hundred eleven thousand, seven hundred sixteen".