261365522211 has 48 divisors (see below), whose sum is σ = 417480500736. Its totient is φ = 156726544128.

The previous prime is 261365522203. The next prime is 261365522213. The reversal of 261365522211 is 112225563162.

261365522211 is a `hidden beast` number, since 2 + 61 + 3 + 65 + 522 + 2 + 11 = 666.

It is not a de Polignac number, because 261365522211 - 2³ = 261365522203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261365522213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4060666 + ... + 4124528.

It is an arithmetic number, because the mean of its divisors is an integer number (8697510432).

Almost surely, 2^261365522211 is an apocalyptic number.

261365522211 is a deficient number, since it is larger than the sum of its proper divisors (156114978525).

261365522211 is a wasteful number, since it uses less digits than its factorization.

261365522211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65072 (or 65069 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 261365522211 in words is "two hundred sixty-one billion, three hundred sixty-five million, five hundred twenty-two thousand, two hundred eleven".