261112906800 has 240 divisors, whose sum is σ = 930600571680. Its totient is φ = 69537807360.

The previous prime is 261112906777. The next prime is 261112906843. The reversal of 261112906800 is 8609211162.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 47 ways as a sum of consecutive naturals, for example, 8332762 + ... + 8364038.

It is an arithmetic number, because the mean of its divisors is an integer number (3877502382).

Almost surely, 2^261112906800 is an apocalyptic number.

261112906800 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 261112906800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (465300285840).

261112906800 is an abundant number, since it is smaller than the sum of its proper divisors (669487664880).

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

261112906800 is a wasteful number, since it uses less digits than its factorization.

261112906800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32077 (or 32060 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 261112906800 in words is "two hundred sixty-one billion, one hundred twelve million, nine hundred six thousand, eight hundred".