66540911 has 8 divisors (see below), whose sum is σ = 70545024. Its totient is φ = 62652960.

The previous prime is 66540899. The next prime is 66540913. The reversal of 66540911 is 11904566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66540911 - 2⁶ = 66540847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66540913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27860 + ... + 30153.

It is an arithmetic number, because the mean of its divisors is an integer number (8818128).

Almost surely, 2^66540911 is an apocalyptic number.

66540911 is a deficient number, since it is larger than the sum of its proper divisors (4004113).

66540911 is a wasteful number, since it uses less digits than its factorization.

66540911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58081.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 66540911 is about 8157.2612438244. The cubic root of 66540911 is about 405.2250154362.

The spelling of 66540911 in words is "sixty-six million, five hundred forty thousand, nine hundred eleven".