656646722 has 16 divisors (see below), whose sum is σ = 1008918240. Its totient is φ = 320356512.

The previous prime is 656646721. The next prime is 656646763. The reversal of 656646722 is 227646656.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (656646721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93713 + ... + 100475.

It is an arithmetic number, because the mean of its divisors is an integer number (63057390).

Almost surely, 2^656646722 is an apocalyptic number.

656646722 is a deficient number, since it is larger than the sum of its proper divisors (352271518).

656646722 is a wasteful number, since it uses less digits than its factorization.

656646722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7937.

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

The square root of 656646722 is about 25625.1189655775. The cubic root of 656646722 is about 869.1817391201.

The spelling of 656646722 in words is "six hundred fifty-six million, six hundred forty-six thousand, seven hundred twenty-two".