26779440709 has 4 divisors (see below), whose sum is σ = 30605075104. Its totient is φ = 22953806316.

The previous prime is 26779440703. The next prime is 26779440761. The reversal of 26779440709 is 90704497762.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 26779440709 - 2¹³ = 26779432517 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 26779440709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26779440703) 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, 1912817187 + ... + 1912817200.

It is an arithmetic number, because the mean of its divisors is an integer number (7651268776).

Almost surely, 2^26779440709 is an apocalyptic number.

It is an amenable number.

26779440709 is a deficient number, since it is larger than the sum of its proper divisors (3825634395).

26779440709 is an equidigital number, since it uses as much as digits as its factorization.

26779440709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825634394.

The product of its (nonzero) digits is 5334336, while the sum is 55.

The spelling of 26779440709 in words is "twenty-six billion, seven hundred seventy-nine million, four hundred forty thousand, seven hundred nine".