205123012245 has 48 divisors (see below), whose sum is σ = 356484585600. Its totient is φ = 109110718080.

The previous prime is 205123012243. The next prime is 205123012261. The reversal of 205123012245 is 542210321502.

205123012245 is a `hidden beast` number, since 20 + 512 + 3 + 0 + 122 + 4 + 5 = 666.

It is not a de Polignac number, because 205123012245 - 2¹ = 205123012243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205123012243) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30570951 + ... + 30577659.

It is an arithmetic number, because the mean of its divisors is an integer number (7426762200).

Almost surely, 2^205123012245 is an apocalyptic number.

It is an amenable number.

205123012245 is a deficient number, since it is larger than the sum of its proper divisors (151361573355).

205123012245 is a wasteful number, since it uses less digits than its factorization.

205123012245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410 (or 8407 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 205123012245 its reverse (542210321502), we get a palindrome (747333333747).

The spelling of 205123012245 in words is "two hundred five billion, one hundred twenty-three million, twelve thousand, two hundred forty-five".