205540312145 has 32 divisors (see below), whose sum is σ = 288930329856. Its totient is φ = 137422771200.

The previous prime is 205540312111. The next prime is 205540312147. The reversal of 205540312145 is 541213045502.

It is not a de Polignac number, because 205540312145 - 2¹⁰ = 205540311121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205540312147) 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, 2428022 + ... + 2511248.

It is an arithmetic number, because the mean of its divisors is an integer number (9029072808).

Almost surely, 2^205540312145 is an apocalyptic number.

It is an amenable number.

205540312145 is a deficient number, since it is larger than the sum of its proper divisors (83390017711).

205540312145 is a wasteful number, since it uses less digits than its factorization.

205540312145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85001.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 205540312145 its reverse (541213045502), we get a palindrome (746753357647).

The spelling of 205540312145 in words is "two hundred five billion, five hundred forty million, three hundred twelve thousand, one hundred forty-five".