261268087488 has 112 divisors (see below), whose sum is σ = 694772763360. Its totient is φ = 86649421824.

The previous prime is 261268087469. The next prime is 261268087501. The reversal of 261268087488 is 884780862162.

It is a super-2 number, since 2×261268087488² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32930370 + ... + 32938302.

Almost surely, 2^261268087488 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 261268087488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347386381680).

261268087488 is an abundant number, since it is smaller than the sum of its proper divisors (433504675872).

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

261268087488 is a wasteful number, since it uses less digits than its factorization.

261268087488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8794 (or 8784 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 60.

The spelling of 261268087488 in words is "two hundred sixty-one billion, two hundred sixty-eight million, eighty-seven thousand, four hundred eighty-eight".