655769717 has 2 divisors, whose sum is σ = 655769718. Its totient is φ = 655769716.

The previous prime is 655769693. The next prime is 655769729. The reversal of 655769717 is 717967556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 496353841 + 159415876 = 22279^2 + 12626^2 .

It is a cyclic number.

It is not a de Polignac number, because 655769717 - 2²⁸ = 387334261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655769797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327884858 + 327884859.

It is an arithmetic number, because the mean of its divisors is an integer number (327884859).

Almost surely, 2^655769717 is an apocalyptic number.

It is an amenable number.

655769717 is a deficient number, since it is larger than the sum of its proper divisors (1).

655769717 is an equidigital number, since it uses as much as digits as its factorization.

655769717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2778300, while the sum is 53.

The square root of 655769717 is about 25608.0010348328. The cubic root of 655769717 is about 868.7946124667.

Subtracting from 655769717 its sum of digits (53), we obtain a square (655769664 = 25608²).

The spelling of 655769717 in words is "six hundred fifty-five million, seven hundred sixty-nine thousand, seven hundred seventeen".