205400553 has 16 divisors (see below), whose sum is σ = 278046720. Its totient is φ = 134853264.

The previous prime is 205400549. The next prime is 205400561. The reversal of 205400553 is 355004502.

It is not a de Polignac number, because 205400553 - 2² = 205400549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205400543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118350 + ... + 120072.

It is an arithmetic number, because the mean of its divisors is an integer number (17377920).

Almost surely, 2^205400553 is an apocalyptic number.

It is an amenable number.

205400553 is a deficient number, since it is larger than the sum of its proper divisors (72646167).

205400553 is a wasteful number, since it uses less digits than its factorization.

205400553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308.

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 205400553 is about 14331.8021546489. The cubic root of 205400553 is about 590.0206379834.

The spelling of 205400553 in words is "two hundred five million, four hundred thousand, five hundred fifty-three".