261646168 has 16 divisors (see below), whose sum is σ = 560670480. Its totient is φ = 112134048.

The previous prime is 261646157. The next prime is 261646171. The reversal of 261646168 is 861646162.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 261646168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2336071 + ... + 2336182.

It is an arithmetic number, because the mean of its divisors is an integer number (35041905).

Almost surely, 2^261646168 is an apocalyptic number.

261646168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

261646168 is an abundant number, since it is smaller than the sum of its proper divisors (299024312).

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

261646168 is a wasteful number, since it uses less digits than its factorization.

261646168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4672266 (or 4672262 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 261646168 is about 16175.4804565429. The cubic root of 261646168 is about 639.5946065482.

It can be divided in two parts, 2616 and 46168, that added together give a palindrome (48784).

The spelling of 261646168 in words is "two hundred sixty-one million, six hundred forty-six thousand, one hundred sixty-eight".