261341513244 has 144 divisors (see below), whose sum is σ = 770018296320. Its totient is φ = 73185240960.

The previous prime is 261341513231. The next prime is 261341513261. The reversal of 261341513244 is 442315143162.

261341513244 is a `hidden beast` number, since 2 + 6 + 134 + 1 + 513 + 2 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 261341513199 and 261341513208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13760547 + ... + 13779525.

It is an arithmetic number, because the mean of its divisors is an integer number (5347349280).

Almost surely, 2^261341513244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261341513244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (385009148160).

261341513244 is an abundant number, since it is smaller than the sum of its proper divisors (508676783076).

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

261341513244 is a wasteful number, since it uses less digits than its factorization.

261341513244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20080 (or 20075 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The spelling of 261341513244 in words is "two hundred sixty-one billion, three hundred forty-one million, five hundred thirteen thousand, two hundred forty-four".