261666162 has 24 divisors (see below), whose sum is σ = 567403200. Its totient is φ = 87151320.

The previous prime is 261666161. The next prime is 261666173.

It is a happy number.

261666162 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (261666161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19987 + ... + 30377.

It is an arithmetic number, because the mean of its divisors is an integer number (23641800).

Almost surely, 2^261666162 is an apocalyptic number.

261666162 is an abundant number, since it is smaller than the sum of its proper divisors (305737038).

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

261666162 is a wasteful number, since it uses less digits than its factorization.

261666162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11798 (or 11795 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 261666162 is about 16176.0984789287. The cubic root of 261666162 is about 639.6108979249.

The spelling of 261666162 in words is "two hundred sixty-one million, six hundred sixty-six thousand, one hundred sixty-two".