261274124256 has 96 divisors (see below), whose sum is σ = 704114697888. Its totient is φ = 84780687360.

The previous prime is 261274124239. The next prime is 261274124299. The reversal of 261274124256 is 652421472162.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1726126 + ... + 1871378.

It is an arithmetic number, because the mean of its divisors is an integer number (7334528103).

Almost surely, 2^261274124256 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 261274124256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352057348944).

261274124256 is an abundant number, since it is smaller than the sum of its proper divisors (442840573632).

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

261274124256 is a wasteful number, since it uses less digits than its factorization.

261274124256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145764 (or 145756 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The spelling of 261274124256 in words is "two hundred sixty-one billion, two hundred seventy-four million, one hundred twenty-four thousand, two hundred fifty-six".