261818082 has 20 divisors (see below), whose sum is σ = 586666806. Its totient is φ = 87272640.

The previous prime is 261818057. The next prime is 261818101. The reversal of 261818082 is 280818162.

It can be written as a sum of positive squares in only one way, i.e., 165405321 + 96412761 = 12861^2 + 9819^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 807919 + ... + 808242.

Almost surely, 2^261818082 is an apocalyptic number.

261818082 is an abundant number, since it is smaller than the sum of its proper divisors (324848724).

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

261818082 is a wasteful number, since it uses less digits than its factorization.

261818082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616175 (or 1616166 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 261818082 is about 16180.7936146531. The cubic root of 261818082 is about 639.7346572572.

The spelling of 261818082 in words is "two hundred sixty-one million, eight hundred eighteen thousand, eighty-two".