646220606606 has 8 divisors (see below), whose sum is σ = 1020348326280. Its totient is φ = 306104497848.

The previous prime is 646220606593. The next prime is 646220606609. The reversal of 646220606606 is 606606022646.

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

It is a super-2 number, since 2×646220606606² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646220606609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8502902681 + ... + 8502902756.

It is an arithmetic number, because the mean of its divisors is an integer number (127543540785).

Almost surely, 2^646220606606 is an apocalyptic number.

646220606606 is a deficient number, since it is larger than the sum of its proper divisors (374127719674).

646220606606 is a wasteful number, since it uses less digits than its factorization.

646220606606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17005805458.

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 646220606606 in words is "six hundred forty-six billion, two hundred twenty million, six hundred six thousand, six hundred six".