261843085313660 has 48 divisors (see below), whose sum is σ = 550960862608800. Its totient is φ = 104529549583104.

The previous prime is 261843085313617. The next prime is 261843085313669. The reversal of 261843085313660 is 66313580348162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261843085313596 and 261843085313605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261843085313669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 641736674 + ... + 642144566.

It is an arithmetic number, because the mean of its divisors is an integer number (11478351304350).

Almost surely, 2^{261843085313660} is an apocalyptic number.

261843085313660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261843085313660 is an abundant number, since it is smaller than the sum of its proper divisors (289117777295140).

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

261843085313660 is a wasteful number, since it uses less digits than its factorization.

261843085313660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471470 (or 471468 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 261843085313660 in words is "two hundred sixty-one trillion, eight hundred forty-three billion, eighty-five million, three hundred thirteen thousand, six hundred sixty".