261128487225 has 12 divisors (see below), whose sum is σ = 431732432336. Its totient is φ = 139268526480.

The previous prime is 261128487223. The next prime is 261128487239. The reversal of 261128487225 is 522784821162.

It is not a de Polignac number, because 261128487225 - 2¹ = 261128487223 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261128487223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1740856507 + ... + 1740856656.

Almost surely, 2^261128487225 is an apocalyptic number.

261128487225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261128487225 is a deficient number, since it is larger than the sum of its proper divisors (170603945111).

261128487225 is a wasteful number, since it uses less digits than its factorization.

261128487225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481713176 (or 3481713171 counting only the distinct ones).

The product of its digits is 860160, while the sum is 48.

The spelling of 261128487225 in words is "two hundred sixty-one billion, one hundred twenty-eight million, four hundred eighty-seven thousand, two hundred twenty-five".