261094190500 has 192 divisors, whose sum is σ = 705182849280. Its totient is φ = 83026944000.

The previous prime is 261094190473. The next prime is 261094190501. The reversal of 261094190500 is 5091490162.

It is a self number, because there is not a number n which added to its sum of digits gives 261094190500.

It is not an unprimeable number, because it can be changed into a prime (261094190501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1262404 + ... + 1454596.

It is an arithmetic number, because the mean of its divisors is an integer number (3672827340).

Almost surely, 2^261094190500 is an apocalyptic number.

261094190500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261094190500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352591424640).

261094190500 is an abundant number, since it is smaller than the sum of its proper divisors (444088658780).

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

261094190500 is a wasteful number, since it uses less digits than its factorization.

261094190500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192255 (or 192243 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 261094190500 in words is "two hundred sixty-one billion, ninety-four million, one hundred ninety thousand, five hundred".