205265315993 has 2 divisors, whose sum is σ = 205265315994. Its totient is φ = 205265315992.

The previous prime is 205265315921. The next prime is 205265315999. The reversal of 205265315993 is 399513562502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167732840704 + 37532475289 = 409552^2 + 193733^2 .

It is a cyclic number.

It is not a de Polignac number, because 205265315993 - 2⁸ = 205265315737 is a prime.

It is a super-2 number, since 2×205265315993² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205265315999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102632657996 + 102632657997.

It is an arithmetic number, because the mean of its divisors is an integer number (102632657997).

Almost surely, 2^205265315993 is an apocalyptic number.

It is an amenable number.

205265315993 is a deficient number, since it is larger than the sum of its proper divisors (1).

205265315993 is an equidigital number, since it uses as much as digits as its factorization.

205265315993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187000, while the sum is 50.

The spelling of 205265315993 in words is "two hundred five billion, two hundred sixty-five million, three hundred fifteen thousand, nine hundred ninety-three".