261606046346205 has 64 divisors (see below), whose sum is σ = 467890423418880. Its totient is φ = 123717233606400.

The previous prime is 261606046346191. The next prime is 261606046346209. The reversal of 261606046346205 is 502643640606162.

It is not a de Polignac number, because 261606046346205 - 2⁷ = 261606046346077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261606046346209) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20539786 + ... + 30742395.

It is an arithmetic number, because the mean of its divisors is an integer number (7310787865920).

Almost surely, 2^{261606046346205} is an apocalyptic number.

It is an amenable number.

261606046346205 is a deficient number, since it is larger than the sum of its proper divisors (206284377072675).

261606046346205 is a wasteful number, since it uses less digits than its factorization.

261606046346205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51282962.

The product of its (nonzero) digits is 7464960, while the sum is 51.

The spelling of 261606046346205 in words is "two hundred sixty-one trillion, six hundred six billion, forty-six million, three hundred forty-six thousand, two hundred five".