261324868212 has 36 divisors (see below), whose sum is σ = 678424473636. Its totient is φ = 84754010880.

The previous prime is 261324868187. The next prime is 261324868219. The reversal of 261324868212 is 212868423162.

261324868212 is a `hidden beast` number, since 2 + 61 + 32 + 486 + 82 + 1 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 203289167376 + 58035700836 = 450876^2 + 240906^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261324868219) 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, 98093589 + ... + 98096252.

Almost surely, 2^261324868212 is an apocalyptic number.

It is an amenable number.

261324868212 is an abundant number, since it is smaller than the sum of its proper divisors (417099605424).

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

261324868212 is a wasteful number, since it uses less digits than its factorization.

261324868212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196189888 (or 196189883 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The spelling of 261324868212 in words is "two hundred sixty-one billion, three hundred twenty-four million, eight hundred sixty-eight thousand, two hundred twelve".