655106561 has 2 divisors, whose sum is σ = 655106562. Its totient is φ = 655106560.

The previous prime is 655106519. The next prime is 655106579. The reversal of 655106561 is 165601556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602457025 + 52649536 = 24545^2 + 7256^2 .

It is a cyclic number.

It is not a de Polignac number, because 655106561 - 2¹⁰ = 655105537 is a prime.

It is not a weakly prime, because it can be changed into another prime (655106581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327553280 + 327553281.

It is an arithmetic number, because the mean of its divisors is an integer number (327553281).

Almost surely, 2^655106561 is an apocalyptic number.

It is an amenable number.

655106561 is a deficient number, since it is larger than the sum of its proper divisors (1).

655106561 is an equidigital number, since it uses as much as digits as its factorization.

655106561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 655106561 is about 25595.0495408780. The cubic root of 655106561 is about 868.5016535889.

The spelling of 655106561 in words is "six hundred fifty-five million, one hundred six thousand, five hundred sixty-one".