66111560 has 16 divisors (see below), whose sum is σ = 148751100. Its totient is φ = 26444608.

The previous prime is 66111559. The next prime is 66111587. The reversal of 66111560 is 6511166.

It can be written as a sum of positive squares in 2 ways, for example, as 65254084 + 857476 = 8078^2 + 926^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826355 + ... + 826434.

Almost surely, 2^66111560 is an apocalyptic number.

It is an amenable number.

66111560 is an abundant number, since it is smaller than the sum of its proper divisors (82639540).

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

66111560 is a wasteful number, since it uses less digits than its factorization.

66111560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652800 (or 1652796 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 66111560 is about 8130.9015490289. The cubic root of 66111560 is about 404.3515712318.

It can be divided in two parts, 661 and 11560, that added together give a palindrome (12221).

The spelling of 66111560 in words is "sixty-six million, one hundred eleven thousand, five hundred sixty".