206505315555 has 96 divisors (see below), whose sum is σ = 419463733248. Its totient is φ = 85785638400.

The previous prime is 206505315553. The next prime is 206505315581. The reversal of 206505315555 is 555513505602.

It is not a de Polignac number, because 206505315555 - 2¹ = 206505315553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206505315553) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 32927070 + ... + 32933340.

It is an arithmetic number, because the mean of its divisors is an integer number (4369413888).

Almost surely, 2^206505315555 is an apocalyptic number.

206505315555 is an abundant number, since it is smaller than the sum of its proper divisors (212958417693).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206505315555 is a wasteful number, since it uses less digits than its factorization.

206505315555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10377 (or 10370 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 42.

The spelling of 206505315555 in words is "two hundred six billion, five hundred five million, three hundred fifteen thousand, five hundred fifty-five".