66220006 has 4 divisors (see below), whose sum is σ = 99330012. Its totient is φ = 33110002.

The previous prime is 66220003. The next prime is 66220027. The reversal of 66220006 is 60002266.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66220003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16555000 + ... + 16555003.

It is an arithmetic number, because the mean of its divisors is an integer number (24832503).

Almost surely, 2^66220006 is an apocalyptic number.

66220006 is a deficient number, since it is larger than the sum of its proper divisors (33110006).

66220006 is a wasteful number, since it uses less digits than its factorization.

66220006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33110005.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 66220006 is about 8137.5675726841. The cubic root of 66220006 is about 404.5725429536.

The spelling of 66220006 in words is "sixty-six million, two hundred twenty thousand, six".