66206638 has 8 divisors (see below), whose sum is σ = 102513600. Its totient is φ = 32035440.

The previous prime is 66206617. The next prime is 66206639. The reversal of 66206638 is 83660266.

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

It is a junction number, because it is equal to n+sod(n) for n = 66206597 and 66206606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206639) 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, 533863 + ... + 533986.

It is an arithmetic number, because the mean of its divisors is an integer number (12814200).

Almost surely, 2^66206638 is an apocalyptic number.

66206638 is a deficient number, since it is larger than the sum of its proper divisors (36306962).

66206638 is a wasteful number, since it uses less digits than its factorization.

66206638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067882.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 66206638 is about 8136.7461555587. The cubic root of 66206638 is about 404.5453170941.

The spelling of 66206638 in words is "sixty-six million, two hundred six thousand, six hundred thirty-eight".