261194868 has 168 divisors, whose sum is σ = 793255680. Its totient is φ = 74338560.

The previous prime is 261194861. The next prime is 261194873. The reversal of 261194868 is 868491162.

Its product of digits (165888) is a multiple of the sum of its prime divisors (512).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261194861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 545053 + ... + 545531.

It is an arithmetic number, because the mean of its divisors is an integer number (4721760).

Almost surely, 2^261194868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261194868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (396627840).

261194868 is an abundant number, since it is smaller than the sum of its proper divisors (532060812).

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

261194868 is a wasteful number, since it uses less digits than its factorization.

261194868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 512 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 261194868 is about 16161.5243092971. The cubic root of 261194868 is about 639.2266603176.

It can be divided in two parts, 2611 and 94868, that added together give a palindrome (97479).

The spelling of 261194868 in words is "two hundred sixty-one million, one hundred ninety-four thousand, eight hundred sixty-eight".