26165052261 has 12 divisors (see below), whose sum is σ = 37805252940. Its totient is φ = 17438158080.

The previous prime is 26165052253. The next prime is 26165052337. The reversal of 26165052261 is 16225056162.

26165052261 is a `hidden beast` number, since 26 + 1 + 6 + 50 + 522 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15296989761 + 10868062500 = 123681^2 + 104250^2 .

It is not a de Polignac number, because 26165052261 - 2³ = 26165052253 is a prime.

It is a super-2 number, since 2×26165052261² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26165052211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 402246 + ... + 462743.

It is an arithmetic number, because the mean of its divisors is an integer number (3150437745).

Almost surely, 2^26165052261 is an apocalyptic number.

It is an amenable number.

26165052261 is a deficient number, since it is larger than the sum of its proper divisors (11640200679).

26165052261 is a wasteful number, since it uses less digits than its factorization.

26165052261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868356 (or 868353 counting only the distinct ones).

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

The spelling of 26165052261 in words is "twenty-six billion, one hundred sixty-five million, fifty-two thousand, two hundred sixty-one".