26540251689 has 16 divisors (see below), whose sum is σ = 40494903680. Its totient is φ = 15146127360.

The previous prime is 26540251679. The next prime is 26540251753. The reversal of 26540251689 is 98615204562.

It is not a de Polignac number, because 26540251689 - 2²⁰ = 26539203113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26540251649) 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 15 ways as a sum of consecutive naturals, for example, 805582 + ... + 837879.

It is an arithmetic number, because the mean of its divisors is an integer number (2530931480).

Almost surely, 2^26540251689 is an apocalyptic number.

It is an amenable number.

26540251689 is a deficient number, since it is larger than the sum of its proper divisors (13954651991).

26540251689 is a wasteful number, since it uses less digits than its factorization.

26540251689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644240.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 26540251689 in words is "twenty-six billion, five hundred forty million, two hundred fifty-one thousand, six hundred eighty-nine".