66711560 has 16 divisors (see below), whose sum is σ = 150101100. Its totient is φ = 26684608.

The previous prime is 66711517. The next prime is 66711607. The reversal of 66711560 is 6511766.

66711560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 65642404 + 1069156 = 8102^2 + 1034^2 .

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 3 ways as a sum of consecutive naturals, for example, 833855 + ... + 833934.

Almost surely, 2^66711560 is an apocalyptic number.

It is an amenable number.

66711560 is an abundant number, since it is smaller than the sum of its proper divisors (83389540).

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

66711560 is a wasteful number, since it uses less digits than its factorization.

66711560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667800 (or 1667796 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 66711560 is about 8167.7144906026. The cubic root of 66711560 is about 405.5711293895.

The spelling of 66711560 in words is "sixty-six million, seven hundred eleven thousand, five hundred sixty".