261275110500 has 48 divisors (see below), whose sum is σ = 760833126144. Its totient is φ = 69673362400.

The previous prime is 261275110493. The next prime is 261275110553. The reversal of 261275110500 is 5011572162.

261275110500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 87090204 + ... + 87093203.

It is an arithmetic number, because the mean of its divisors is an integer number (15850690128).

Almost surely, 2^261275110500 is an apocalyptic number.

261275110500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261275110500 is an abundant number, since it is smaller than the sum of its proper divisors (499558015644).

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

261275110500 is a wasteful number, since it uses less digits than its factorization.

261275110500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174183429 (or 174183417 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 261275110500 its reverse (5011572162), we get a palindrome (266286682662).

The spelling of 261275110500 in words is "two hundred sixty-one billion, two hundred seventy-five million, one hundred ten thousand, five hundred".