261662643321230 has 16 divisors (see below), whose sum is σ = 471008956622400. Its totient is φ = 104661457629792.

The previous prime is 261662643321223. The next prime is 261662643321293. The reversal of 261662643321230 is 32123346266162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449657030 + ... + 450238569.

It is an arithmetic number, because the mean of its divisors is an integer number (29438059788900).

Almost surely, 2^{261662643321230} is an apocalyptic number.

261662643321230 is a deficient number, since it is larger than the sum of its proper divisors (209346313301170).

261662643321230 is a wasteful number, since it uses less digits than its factorization.

261662643321230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899924683.

The product of its (nonzero) digits is 2239488, while the sum is 47.

Adding to 261662643321230 its reverse (32123346266162), we get a palindrome (293785989587392).

The spelling of 261662643321230 in words is "two hundred sixty-one trillion, six hundred sixty-two billion, six hundred forty-three million, three hundred twenty-one thousand, two hundred thirty".