66755660 has 24 divisors (see below), whose sum is σ = 146282976. Its totient is φ = 25541120.

The previous prime is 66755641. The next prime is 66755669. The reversal of 66755660 is 6655766.

It is not an unprimeable number, because it can be changed into a prime (66755669) 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, 72101 + ... + 73020.

It is an arithmetic number, because the mean of its divisors is an integer number (6095124).

Almost surely, 2^66755660 is an apocalyptic number.

It is an amenable number.

66755660 is an abundant number, since it is smaller than the sum of its proper divisors (79527316).

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

66755660 is a wasteful number, since it uses less digits than its factorization.

66755660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145153 (or 145151 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 66755660 is about 8170.4136982163. The cubic root of 66755660 is about 405.6604779577.

The spelling of 66755660 in words is "sixty-six million, seven hundred fifty-five thousand, six hundred sixty".