205557427965 has 16 divisors (see below), whose sum is σ = 329929406208. Its totient is φ = 109284787776.

The previous prime is 205557427951. The next prime is 205557427991. The reversal of 205557427965 is 569724755502.

It is not a de Polignac number, because 205557427965 - 2²² = 205553233661 is a prime.

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, 21610117 + ... + 21619626.

It is an arithmetic number, because the mean of its divisors is an integer number (20620587888).

Almost surely, 2^205557427965 is an apocalyptic number.

It is an amenable number.

205557427965 is a deficient number, since it is larger than the sum of its proper divisors (124371978243).

205557427965 is a wasteful number, since it uses less digits than its factorization.

205557427965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43230068.

The product of its (nonzero) digits is 26460000, while the sum is 57.

The spelling of 205557427965 in words is "two hundred five billion, five hundred fifty-seven million, four hundred twenty-seven thousand, nine hundred sixty-five".