646566722 has 8 divisors (see below), whose sum is σ = 986288400. Its totient is φ = 317803924.

The previous prime is 646566707. The next prime is 646566727. The reversal of 646566722 is 227665646.

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

It is not an unprimeable number, because it can be changed into a prime (646566727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2739572 + ... + 2739807.

It is an arithmetic number, because the mean of its divisors is an integer number (123286050).

Almost surely, 2^646566722 is an apocalyptic number.

646566722 is a deficient number, since it is larger than the sum of its proper divisors (339721678).

646566722 is a wasteful number, since it uses less digits than its factorization.

646566722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5479440.

The product of its digits is 725760, while the sum is 44.

The square root of 646566722 is about 25427.6762996543. The cubic root of 646566722 is about 864.7112636272.

The spelling of 646566722 in words is "six hundred forty-six million, five hundred sixty-six thousand, seven hundred twenty-two".