66540206 has 8 divisors (see below), whose sum is σ = 101216304. Its totient is φ = 32801440.

The previous prime is 66540191. The next prime is 66540209. The reversal of 66540206 is 60204566.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66540209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234155 + ... + 234438.

It is an arithmetic number, because the mean of its divisors is an integer number (12652038).

Almost surely, 2^66540206 is an apocalyptic number.

66540206 is a deficient number, since it is larger than the sum of its proper divisors (34676098).

66540206 is a wasteful number, since it uses less digits than its factorization.

66540206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468666.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66540206 is about 8157.2180306769. The cubic root of 66540206 is about 405.2235843134.

The spelling of 66540206 in words is "sixty-six million, five hundred forty thousand, two hundred six".