261335123203 has 32 divisors (see below), whose sum is σ = 343164211200. Its totient is φ = 192963392160.

The previous prime is 261335123197. The next prime is 261335123221. The reversal of 261335123203 is 302321533162.

It is not a de Polignac number, because 261335123203 - 2⁵ = 261335123171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261335123233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500053 + ... + 879046.

It is an arithmetic number, because the mean of its divisors is an integer number (10723881600).

Almost surely, 2^261335123203 is an apocalyptic number.

261335123203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261335123203 is a deficient number, since it is larger than the sum of its proper divisors (81829087997).

261335123203 is a wasteful number, since it uses less digits than its factorization.

261335123203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379247.

The product of its (nonzero) digits is 19440, while the sum is 31.

Adding to 261335123203 its reverse (302321533162), we get a palindrome (563656656365).

The spelling of 261335123203 in words is "two hundred sixty-one billion, three hundred thirty-five million, one hundred twenty-three thousand, two hundred three".