660505955069 has 2 divisors, whose sum is σ = 660505955070. Its totient is φ = 660505955068.

The previous prime is 660505955027. The next prime is 660505955107. The reversal of 660505955069 is 960559505066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487085347225 + 173420607844 = 697915^2 + 416438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660505955069 is a prime.

It is a super-2 number, since 2×660505955069² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660505951069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330252977534 + 330252977535.

It is an arithmetic number, because the mean of its divisors is an integer number (330252977535).

Almost surely, 2^660505955069 is an apocalyptic number.

It is an amenable number.

660505955069 is a deficient number, since it is larger than the sum of its proper divisors (1).

660505955069 is an equidigital number, since it uses as much as digits as its factorization.

660505955069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10935000, while the sum is 56.

The spelling of 660505955069 in words is "six hundred sixty billion, five hundred five million, nine hundred fifty-five thousand, sixty-nine".