66116560 has 40 divisors (see below), whose sum is σ = 154561536. Its totient is φ = 26302080.

The previous prime is 66116551. The next prime is 66116563. The reversal of 66116560 is 6561166.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66116563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13117 + ... + 17443.

Almost surely, 2^66116560 is an apocalyptic number.

It is an amenable number.

66116560 is an abundant number, since it is smaller than the sum of its proper divisors (88444976).

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

66116560 is a wasteful number, since it uses less digits than its factorization.

66116560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4531 (or 4525 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66116560 is about 8131.2090121949. The cubic root of 66116560 is about 404.3617646427.

The spelling of 66116560 in words is "sixty-six million, one hundred sixteen thousand, five hundred sixty".