656679049281 has 12 divisors (see below), whose sum is σ = 974172524052. Its totient is φ = 425953977696.

The previous prime is 656679049249. The next prime is 656679049297. The reversal of 656679049281 is 182940976656.

656679049281 is a `hidden beast` number, since 6 + 5 + 6 + 67 + 9 + 0 + 492 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 594311479056 + 62367570225 = 770916^2 + 249735^2 .

It is not a de Polignac number, because 656679049281 - 2⁵ = 656679049249 is a prime.

It is a super-2 number, since 2×656679049281² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656679049181) 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 11 ways as a sum of consecutive naturals, for example, 986004246 + ... + 986004911.

It is an arithmetic number, because the mean of its divisors is an integer number (81181043671).

Almost surely, 2^656679049281 is an apocalyptic number.

It is an amenable number.

656679049281 is a deficient number, since it is larger than the sum of its proper divisors (317493474771).

656679049281 is a wasteful number, since it uses less digits than its factorization.

656679049281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972009200 (or 1972009197 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 656679049281 in words is "six hundred fifty-six billion, six hundred seventy-nine million, forty-nine thousand, two hundred eighty-one".