205231161213 has 64 divisors (see below), whose sum is σ = 330251980800. Its totient is φ = 125212651200.

The previous prime is 205231161193. The next prime is 205231161227. The reversal of 205231161213 is 312161132502.

205231161213 is a `hidden beast` number, since 2 + 0 + 5 + 2 + 31 + 1 + 612 + 13 = 666.

It is not a de Polignac number, because 205231161213 - 2⁸ = 205231160957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205231161253) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28988008 + ... + 28995086.

It is an arithmetic number, because the mean of its divisors is an integer number (5160187200).

Almost surely, 2^205231161213 is an apocalyptic number.

It is an amenable number.

205231161213 is a deficient number, since it is larger than the sum of its proper divisors (125020819587).

205231161213 is a wasteful number, since it uses less digits than its factorization.

205231161213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7799 (or 7793 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 205231161213 its reverse (312161132502), we get a palindrome (517392293715).

The spelling of 205231161213 in words is "two hundred five billion, two hundred thirty-one million, one hundred sixty-one thousand, two hundred thirteen".