205738523405 has 16 divisors (see below), whose sum is σ = 247399536384. Its totient is φ = 164248768320.

The previous prime is 205738523399. The next prime is 205738523413. The reversal of 205738523405 is 504325837502.

It is a happy number.

It is not a de Polignac number, because 205738523405 - 2¹² = 205738519309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15695084 + ... + 15708186.

It is an arithmetic number, because the mean of its divisors is an integer number (15462471024).

Almost surely, 2^205738523405 is an apocalyptic number.

It is an amenable number.

205738523405 is a deficient number, since it is larger than the sum of its proper divisors (41661012979).

205738523405 is a wasteful number, since it uses less digits than its factorization.

205738523405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19396.

The product of its (nonzero) digits is 1008000, while the sum is 44.

The spelling of 205738523405 in words is "two hundred five billion, seven hundred thirty-eight million, five hundred twenty-three thousand, four hundred five".