26431604009 has 4 divisors (see below), whose sum is σ = 27343038660. Its totient is φ = 25520169360.

The previous prime is 26431603993. The next prime is 26431604027. The reversal of 26431604009 is 90040613462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15816835225 + 10614768784 = 125765^2 + 103028^2 .

It is not a de Polignac number, because 26431604009 - 2⁴ = 26431603993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26431604009.

It is not an unprimeable number, because it can be changed into a prime (26431604039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455717282 + ... + 455717339.

It is an arithmetic number, because the mean of its divisors is an integer number (6835759665).

Almost surely, 2^26431604009 is an apocalyptic number.

26431604009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

26431604009 is a deficient number, since it is larger than the sum of its proper divisors (911434651).

26431604009 is an equidigital number, since it uses as much as digits as its factorization.

26431604009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911434650.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 26431604009 in words is "twenty-six billion, four hundred thirty-one million, six hundred four thousand, nine".