655360261 has 2 divisors, whose sum is σ = 655360262. Its totient is φ = 655360260.

The previous prime is 655360253. The next prime is 655360267. The reversal of 655360261 is 162063556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 642622500 + 12737761 = 25350^2 + 3569^2 .

It is a cyclic number.

It is not a de Polignac number, because 655360261 - 2³ = 655360253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655360267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327680130 + 327680131.

It is an arithmetic number, because the mean of its divisors is an integer number (327680131).

Almost surely, 2^655360261 is an apocalyptic number.

It is an amenable number.

655360261 is a deficient number, since it is larger than the sum of its proper divisors (1).

655360261 is an equidigital number, since it uses as much as digits as its factorization.

655360261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 655360261 is about 25600.0050976557. The cubic root of 655360261 is about 868.6137526201.

The spelling of 655360261 in words is "six hundred fifty-five million, three hundred sixty thousand, two hundred sixty-one".