2255647561 has 2 divisors, whose sum is σ = 2255647562. Its totient is φ = 2255647560.

The previous prime is 2255647553. The next prime is 2255647609. The reversal of 2255647561 is 1657465522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2143690000 + 111957561 = 46300^2 + 10581^2 .

It is a cyclic number.

It is not a de Polignac number, because 2255647561 - 2³ = 2255647553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2255647531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1127823780 + 1127823781.

It is an arithmetic number, because the mean of its divisors is an integer number (1127823781).

Almost surely, 2^2255647561 is an apocalyptic number.

It is an amenable number.

2255647561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2255647561 is an equidigital number, since it uses as much as digits as its factorization.

2255647561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504000, while the sum is 43.

The square root of 2255647561 is about 47493.6581134787. The cubic root of 2255647561 is about 1311.4661364127.

The spelling of 2255647561 in words is "two billion, two hundred fifty-five million, six hundred forty-seven thousand, five hundred sixty-one".