205535521455 has 32 divisors (see below), whose sum is σ = 359044697088. Its totient is φ = 99572534400.

The previous prime is 205535521453. The next prime is 205535521489. The reversal of 205535521455 is 554125535502.

It is not a de Polignac number, because 205535521455 - 2¹ = 205535521453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205535521453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302844 + ... + 709073.

It is an arithmetic number, because the mean of its divisors is an integer number (11220146784).

Almost surely, 2^205535521455 is an apocalyptic number.

205535521455 is a deficient number, since it is larger than the sum of its proper divisors (153509175633).

205535521455 is a wasteful number, since it uses less digits than its factorization.

205535521455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013167.

The product of its (nonzero) digits is 750000, while the sum is 42.

The spelling of 205535521455 in words is "two hundred five billion, five hundred thirty-five million, five hundred twenty-one thousand, four hundred fifty-five".