66556116 has 36 divisors (see below), whose sum is σ = 183534624. Its totient is φ = 20168400.

The previous prime is 66556111. The next prime is 66556117. The reversal of 66556116 is 61165566.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66556111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83640 + ... + 84431.

It is an arithmetic number, because the mean of its divisors is an integer number (5098184).

Almost surely, 2^66556116 is an apocalyptic number.

66556116 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66556116 is an abundant number, since it is smaller than the sum of its proper divisors (116978508).

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

66556116 is a wasteful number, since it uses less digits than its factorization.

66556116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168092 (or 168087 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 66556116 is about 8158.1931823168. The cubic root of 66556116 is about 405.2558785400.

The spelling of 66556116 in words is "sixty-six million, five hundred fifty-six thousand, one hundred sixteen".