26161085729 has 8 divisors (see below), whose sum is σ = 26396151432. Its totient is φ = 25926082560.

The previous prime is 26161085651. The next prime is 26161085737. The reversal of 26161085729 is 92758016162.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1530922129 + 24630163600 = 39127^2 + 156940^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26161085729 - 2²⁴ = 26144308513 is a prime.

It is a super-2 number, since 2×26161085729² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26161085759) 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 7 ways as a sum of consecutive naturals, for example, 1373777 + ... + 1392689.

It is an arithmetic number, because the mean of its divisors is an integer number (3299518929).

Almost surely, 2^26161085729 is an apocalyptic number.

It is an amenable number.

26161085729 is a deficient number, since it is larger than the sum of its proper divisors (235065703).

26161085729 is a wasteful number, since it uses less digits than its factorization.

26161085729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31267.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 26161085729 in words is "twenty-six billion, one hundred sixty-one million, eighty-five thousand, seven hundred twenty-nine".