26165561061 has 16 divisors (see below), whose sum is σ = 35241212160. Its totient is φ = 17266891200.

The previous prime is 26165561041. The next prime is 26165561069. The reversal of 26165561061 is 16016556162.

It is not a de Polignac number, because 26165561061 - 2¹⁷ = 26165429989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26165561069) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1781295 + ... + 1795923.

It is an arithmetic number, because the mean of its divisors is an integer number (2202575760).

Almost surely, 2^26165561061 is an apocalyptic number.

It is an amenable number.

26165561061 is a deficient number, since it is larger than the sum of its proper divisors (9075651099).

26165561061 is a wasteful number, since it uses less digits than its factorization.

26165561061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20636.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 26165561061 in words is "twenty-six billion, one hundred sixty-five million, five hundred sixty-one thousand, sixty-one".