261265082260 has 192 divisors, whose sum is σ = 686768947200. Its totient is φ = 81287152128.

The previous prime is 261265082237. The next prime is 261265082297. The reversal of 261265082260 is 62280562162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34359619 + ... + 34367221.

It is an arithmetic number, because the mean of its divisors is an integer number (3576921600).

Almost surely, 2^261265082260 is an apocalyptic number.

261265082260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261265082260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343384473600).

261265082260 is an abundant number, since it is smaller than the sum of its proper divisors (425503864940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261265082260 is a wasteful number, since it uses less digits than its factorization.

261265082260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7950 (or 7948 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 261265082260 in words is "two hundred sixty-one billion, two hundred sixty-five million, eighty-two thousand, two hundred sixty".