66716610 has 32 divisors (see below), whose sum is σ = 162838080. Its totient is φ = 17489088.

The previous prime is 66716609. The next prime is 66716621. The reversal of 66716610 is 1661766.

66716610 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-3 number, since 3×66716610³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17077 + ... + 20616.

It is an arithmetic number, because the mean of its divisors is an integer number (5088690).

Almost surely, 2^66716610 is an apocalyptic number.

66716610 is an abundant number, since it is smaller than the sum of its proper divisors (96121470).

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

66716610 is a wasteful number, since it uses less digits than its factorization.

66716610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37762.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 66716610 is about 8168.0236287611. The cubic root of 66716610 is about 405.5813629109.

The spelling of 66716610 in words is "sixty-six million, seven hundred sixteen thousand, six hundred ten".