261263289792 has 56 divisors (see below), whose sum is σ = 691297372800. Its totient is φ = 87082944256.

The previous prime is 261263289761. The next prime is 261263289803. The reversal of 261263289792 is 297982362162.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 5760259 + ... + 5805437.

Almost surely, 2^261263289792 is an apocalyptic number.

It is an amenable number.

261263289792 is an abundant number, since it is smaller than the sum of its proper divisors (430034083008).

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

261263289792 is a wasteful number, since it uses less digits than its factorization.

261263289792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75313 (or 75303 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 57.

The spelling of 261263289792 in words is "two hundred sixty-one billion, two hundred sixty-three million, two hundred eighty-nine thousand, seven hundred ninety-two".