261210611013 has 8 divisors (see below), whose sum is σ = 379942706976. Its totient is φ = 158309461200.

The previous prime is 261210610987. The next prime is 261210611017. The reversal of 261210611013 is 310116012162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261210611013 - 2⁶ = 261210610949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261210611017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3957736498 + ... + 3957736563.

It is an arithmetic number, because the mean of its divisors is an integer number (47492838372).

Almost surely, 2^261210611013 is an apocalyptic number.

It is an amenable number.

261210611013 is a deficient number, since it is larger than the sum of its proper divisors (118732095963).

261210611013 is a wasteful number, since it uses less digits than its factorization.

261210611013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7915473075.

The product of its (nonzero) digits is 432, while the sum is 24.

Adding to 261210611013 its reverse (310116012162), we get a palindrome (571326623175).

The spelling of 261210611013 in words is "two hundred sixty-one billion, two hundred ten million, six hundred eleven thousand, thirteen".