205120055315 has 16 divisors (see below), whose sum is σ = 296113163520. Its totient is φ = 133250922720.

The previous prime is 205120055311. The next prime is 205120055333. The reversal of 205120055315 is 513550021502.

It is not a de Polignac number, because 205120055315 - 2² = 205120055311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205120055311) 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, 154224941 + ... + 154226270.

It is an arithmetic number, because the mean of its divisors is an integer number (18507072720).

Almost surely, 2^205120055315 is an apocalyptic number.

205120055315 is a deficient number, since it is larger than the sum of its proper divisors (90993108205).

205120055315 is a wasteful number, since it uses less digits than its factorization.

205120055315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308451242.

The product of its (nonzero) digits is 7500, while the sum is 29.

Adding to 205120055315 its reverse (513550021502), we get a palindrome (718670076817).

The spelling of 205120055315 in words is "two hundred five billion, one hundred twenty million, fifty-five thousand, three hundred fifteen".