66755916 has 18 divisors (see below), whose sum is σ = 168744212. Its totient is φ = 22251960.

The previous prime is 66755903. The next prime is 66755917. The reversal of 66755916 is 61955766.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (66755917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 927130 + ... + 927201.

Almost surely, 2^66755916 is an apocalyptic number.

It is an amenable number.

66755916 is an abundant number, since it is smaller than the sum of its proper divisors (101988296).

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

66755916 is a wasteful number, since it uses less digits than its factorization.

66755916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854341 (or 1854336 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 66755916 is about 8170.4293644826. The cubic root of 66755916 is about 405.6609965103.

The spelling of 66755916 in words is "sixty-six million, seven hundred fifty-five thousand, nine hundred sixteen".