261534331222625 has 32 divisors (see below), whose sum is σ = 326833099991424. Its totient is φ = 208946570952000.

The previous prime is 261534331222597. The next prime is 261534331222627. The reversal of 261534331222625 is 526222133435162.

It is not a de Polignac number, because 261534331222625 - 2¹⁶ = 261534331157089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261534331222625.

It is not an unprimeable number, because it can be changed into a prime (261534331222627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1483701995 + ... + 1483878255.

It is an arithmetic number, because the mean of its divisors is an integer number (10213534374732).

Almost surely, 2^{261534331222625} is an apocalyptic number.

261534331222625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261534331222625 is a deficient number, since it is larger than the sum of its proper divisors (65298768768799).

261534331222625 is a wasteful number, since it uses less digits than its factorization.

261534331222625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192146 (or 192136 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 47.

Adding to 261534331222625 its reverse (526222133435162), we get a palindrome (787756464657787).

The spelling of 261534331222625 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, three hundred thirty-one million, two hundred twenty-two thousand, six hundred twenty-five".