261136466516212 has 36 divisors (see below), whose sum is σ = 545966782326084. Its totient is φ = 108890881787520.

The previous prime is 261136466516203. The next prime is 261136466516279. The reversal of 261136466516212 is 212615664631162.

It can be written as a sum of positive squares in 2 ways, for example, as 174862909333476 + 86273557182736 = 13223574^2 + 9288356^2 .

It is a super-2 number, since 2×261136466516212² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261136466516212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18004437489 + ... + 18004451992.

Almost surely, 2^{261136466516212} is an apocalyptic number.

It is an amenable number.

261136466516212 is an abundant number, since it is smaller than the sum of its proper divisors (284830315809872).

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

261136466516212 is a wasteful number, since it uses less digits than its factorization.

261136466516212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36008889536 (or 36008889527 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 52.

The spelling of 261136466516212 in words is "two hundred sixty-one trillion, one hundred thirty-six billion, four hundred sixty-six million, five hundred sixteen thousand, two hundred twelve".