26438514665 has 16 divisors (see below), whose sum is σ = 33596395920. Its totient is φ = 19904317440.

The previous prime is 26438514607. The next prime is 26438514671. The reversal of 26438514665 is 56641583462.

It can be written as a sum of positive squares in 8 ways, for example, as 1350489001 + 25088025664 = 36749^2 + 158392^2 .

It is not a de Polignac number, because 26438514665 - 2²⁰ = 26437466089 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1154951 + ... + 1177619.

It is an arithmetic number, because the mean of its divisors is an integer number (2099774745).

Almost surely, 2^26438514665 is an apocalyptic number.

It is an amenable number.

26438514665 is a deficient number, since it is larger than the sum of its proper divisors (7157881255).

26438514665 is a wasteful number, since it uses less digits than its factorization.

26438514665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36412.

The product of its digits is 4147200, while the sum is 50.

The spelling of 26438514665 in words is "twenty-six billion, four hundred thirty-eight million, five hundred fourteen thousand, six hundred sixty-five".