66165040 has 20 divisors (see below), whose sum is σ = 153833904. Its totient is φ = 26465984.

The previous prime is 66165031. The next prime is 66165059. The reversal of 66165040 is 4056166.

66165040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413452 + ... + 413611.

Almost surely, 2^66165040 is an apocalyptic number.

It is an amenable number.

66165040 is an abundant number, since it is smaller than the sum of its proper divisors (87668864).

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

66165040 is a wasteful number, since it uses less digits than its factorization.

66165040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827076 (or 827070 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 66165040 is about 8134.1895724159. The cubic root of 66165040 is about 404.4605733168.

The spelling of 66165040 in words is "sixty-six million, one hundred sixty-five thousand, forty".