2656646261 has 2 divisors, whose sum is σ = 2656646262. Its totient is φ = 2656646260.

The previous prime is 2656646249. The next prime is 2656646273. The reversal of 2656646261 is 1626466562.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (2656646249) and next prime (2656646273).

It can be written as a sum of positive squares in only one way, i.e., 2611823236 + 44823025 = 51106^2 + 6695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2656646261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656645261) 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 as a sum of consecutive naturals, namely, 1328323130 + 1328323131.

It is an arithmetic number, because the mean of its divisors is an integer number (1328323131).

Almost surely, 2^2656646261 is an apocalyptic number.

It is an amenable number.

2656646261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656646261 is an equidigital number, since it uses as much as digits as its factorization.

2656646261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 44.

The square root of 2656646261 is about 51542.6644732303. The cubic root of 2656646261 is about 1384.9834282316.

It can be divided in two parts, 26566 and 46261, that added together give a palindrome (72827).

The spelling of 2656646261 in words is "two billion, six hundred fifty-six million, six hundred forty-six thousand, two hundred sixty-one".