205353439457 has 2 divisors, whose sum is σ = 205353439458. Its totient is φ = 205353439456.

The previous prime is 205353439451. The next prime is 205353439493. The reversal of 205353439457 is 754934353502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167546136976 + 37807302481 = 409324^2 + 194441^2 .

It is a cyclic number.

It is not a de Polignac number, because 205353439457 - 2¹² = 205353435361 is a prime.

It is not a weakly prime, because it can be changed into another prime (205353439451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102676719728 + 102676719729.

It is an arithmetic number, because the mean of its divisors is an integer number (102676719729).

Almost surely, 2^205353439457 is an apocalyptic number.

It is an amenable number.

205353439457 is a deficient number, since it is larger than the sum of its proper divisors (1).

205353439457 is an equidigital number, since it uses as much as digits as its factorization.

205353439457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804000, while the sum is 50.

The spelling of 205353439457 in words is "two hundred five billion, three hundred fifty-three million, four hundred thirty-nine thousand, four hundred fifty-seven".