261140302500 has 240 divisors, whose sum is σ = 949299326976. Its totient is φ = 54262800000.

The previous prime is 261140302447. The next prime is 261140302517. The reversal of 261140302500 is 5203041162.

261140302500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 351405 + ... + 803595.

Almost surely, 2^261140302500 is an apocalyptic number.

261140302500 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 261140302500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474649663488).

261140302500 is an abundant number, since it is smaller than the sum of its proper divisors (688159024476).

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

261140302500 is a wasteful number, since it uses less digits than its factorization.

261140302500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452236 (or 452219 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 261140302500 its reverse (5203041162), we get a palindrome (266343343662).

The spelling of 261140302500 in words is "two hundred sixty-one billion, one hundred forty million, three hundred two thousand, five hundred".