656204356340 has 96 divisors (see below), whose sum is σ = 1496535221664. Its totient is φ = 240253378560.

The previous prime is 656204356307. The next prime is 656204356349. The reversal of 656204356340 is 43653402656.

It can be written as a sum of positive squares in 16 ways, for example, as 379389474916 + 276814881424 = 615946^2 + 526132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 656204356291 and 656204356300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656204356349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33366110 + ... + 33385770.

It is an arithmetic number, because the mean of its divisors is an integer number (15588908559).

Almost surely, 2^656204356340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656204356340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748267610832).

656204356340 is an abundant number, since it is smaller than the sum of its proper divisors (840330865324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656204356340 is a wasteful number, since it uses less digits than its factorization.

656204356340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20757 (or 20755 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 44.

Adding to 656204356340 its reverse (43653402656), we get a palindrome (699857758996).

The spelling of 656204356340 in words is "six hundred fifty-six billion, two hundred four million, three hundred fifty-six thousand, three hundred forty".