261710561200 has 90 divisors (see below), whose sum is σ = 691116077372. Its totient is φ = 95167459200.

The previous prime is 261710561069. The next prime is 261710561251. The reversal of 261710561200 is 2165017162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2655222 + ... + 2752021.

Almost surely, 2^261710561200 is an apocalyptic number.

261710561200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261710561200 is an abundant number, since it is smaller than the sum of its proper divisors (429405516172).

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

261710561200 is a wasteful number, since it uses less digits than its factorization.

261710561200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5407283 (or 5407261 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

Adding to 261710561200 its reverse (2165017162), we get a palindrome (263875578362).

The spelling of 261710561200 in words is "two hundred sixty-one billion, seven hundred ten million, five hundred sixty-one thousand, two hundred".