261646244132212 has 24 divisors (see below), whose sum is σ = 465590132888552. Its totient is φ = 128622362486400.

The previous prime is 261646244132201. The next prime is 261646244132233. The reversal of 261646244132212 is 212231442646162.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 39663242111376 + 221983002020836 = 6297876^2 + 14899094^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233265339 + ... + 234384322.

Almost surely, 2^{261646244132212} is an apocalyptic number.

It is an amenable number.

261646244132212 is a deficient number, since it is larger than the sum of its proper divisors (203943888756340).

261646244132212 is a wasteful number, since it uses less digits than its factorization.

261646244132212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467652019 (or 467652017 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 46.

Adding to 261646244132212 its reverse (212231442646162), we get a palindrome (473877686778374).

The spelling of 261646244132212 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-four million, one hundred thirty-two thousand, two hundred twelve".