261300424225 has 12 divisors (see below), whose sum is σ = 324020861164. Its totient is φ = 209034961920.

The previous prime is 261300424219. The next prime is 261300424249. The reversal of 261300424225 is 522424003162.

It can be written as a sum of positive squares in 6 ways, for example, as 27585223744 + 233715200481 = 166088^2 + 483441^2 .

It is a de Polignac number, because none of the positive numbers 2^k-261300424225 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1067557 + ... + 1289293.

Almost surely, 2^261300424225 is an apocalyptic number.

261300424225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261300424225 is a deficient number, since it is larger than the sum of its proper divisors (62720436939).

261300424225 is a wasteful number, since it uses less digits than its factorization.

261300424225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268884 (or 268879 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 261300424225 its reverse (522424003162), we get a palindrome (783724427387).

The spelling of 261300424225 in words is "two hundred sixty-one billion, three hundred million, four hundred twenty-four thousand, two hundred twenty-five".