205375697557 has 2 divisors, whose sum is σ = 205375697558. Its totient is φ = 205375697556.

The previous prime is 205375697551. The next prime is 205375697561. The reversal of 205375697557 is 755796573502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203973269956 + 1402427601 = 451634^2 + 37449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205375697557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205375697495 and 205375697504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205375697551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102687848778 + 102687848779.

It is an arithmetic number, because the mean of its divisors is an integer number (102687848779).

Almost surely, 2^205375697557 is an apocalyptic number.

It is an amenable number.

205375697557 is a deficient number, since it is larger than the sum of its proper divisors (1).

205375697557 is an equidigital number, since it uses as much as digits as its factorization.

205375697557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69457500, while the sum is 61.

The spelling of 205375697557 in words is "two hundred five billion, three hundred seventy-five million, six hundred ninety-seven thousand, five hundred fifty-seven".