261222811208 has 12 divisors (see below), whose sum is σ = 489795481545. Its totient is φ = 130610682800.

The previous prime is 261222811169. The next prime is 261222811217. The reversal of 261222811208 is 802118222162.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 174137620804 + 87085190404 = 417298^2 + 295102^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=361402.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1355258 + ... + 1535958.

Almost surely, 2^261222811208 is an apocalyptic number.

It is an amenable number.

261222811208 is a deficient number, since it is larger than the sum of its proper divisors (228572670337).

261222811208 is an frugal number, since it uses more digits than its factorization.

261222811208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361408 (or 180703 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The spelling of 261222811208 in words is "two hundred sixty-one billion, two hundred twenty-two million, eight hundred eleven thousand, two hundred eight".