261205504612 has 12 divisors (see below), whose sum is σ = 492271912636. Its totient is φ = 120556386720.

The previous prime is 261205504583. The next prime is 261205504661. The reversal of 261205504612 is 216405502162.

261205504612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30242601216 + 230962903396 = 173904^2 + 480586^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2511591339 + ... + 2511591442.

Almost surely, 2^261205504612 is an apocalyptic number.

It is an amenable number.

261205504612 is a deficient number, since it is larger than the sum of its proper divisors (231066408024).

261205504612 is a wasteful number, since it uses less digits than its factorization.

261205504612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023182798 (or 5023182796 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 261205504612 in words is "two hundred sixty-one billion, two hundred five million, five hundred four thousand, six hundred twelve".