655361532509 has 2 divisors, whose sum is σ = 655361532510. Its totient is φ = 655361532508.

The previous prime is 655361532473. The next prime is 655361532521. The reversal of 655361532509 is 905235163556.

655361532509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 587555976484 + 67805556025 = 766522^2 + 260395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655361532509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655361532209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327680766254 + 327680766255.

It is an arithmetic number, because the mean of its divisors is an integer number (327680766255).

Almost surely, 2^655361532509 is an apocalyptic number.

It is an amenable number.

655361532509 is a deficient number, since it is larger than the sum of its proper divisors (1).

655361532509 is an equidigital number, since it uses as much as digits as its factorization.

655361532509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3645000, while the sum is 50.

The spelling of 655361532509 in words is "six hundred fifty-five billion, three hundred sixty-one million, five hundred thirty-two thousand, five hundred nine".