205355405343555 has 32 divisors (see below), whose sum is σ = 365089544289600. Its totient is φ = 109518902413056.

The previous prime is 205355405343541. The next prime is 205355405343589. The reversal of 205355405343555 is 555343504553502.

205355405343555 is a `hidden beast` number, since 2 + 0 + 5 + 3 + 5 + 5 + 40 + 5 + 3 + 43 + 555 = 666.

It is not a de Polignac number, because 205355405343555 - 2¹⁰ = 205355405342531 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23911744 + ... + 31344573.

It is an arithmetic number, because the mean of its divisors is an integer number (11409048259050).

Almost surely, 2^{205355405343555} is an apocalyptic number.

205355405343555 is a deficient number, since it is larger than the sum of its proper divisors (159734138946045).

205355405343555 is a wasteful number, since it uses less digits than its factorization.

205355405343555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55283860 (or 55283854 counting only the distinct ones).

The product of its (nonzero) digits is 67500000, while the sum is 54.

The spelling of 205355405343555 in words is "two hundred five trillion, three hundred fifty-five billion, four hundred five million, three hundred forty-three thousand, five hundred fifty-five".