26519792665 has 4 divisors (see below), whose sum is σ = 31823751204. Its totient is φ = 21215834128.

The previous prime is 26519792653. The next prime is 26519792669. The reversal of 26519792665 is 56629791562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56629791562 = 2 ⋅28314895781.

It can be written as a sum of positive squares in 2 ways, for example, as 11534115609 + 14985677056 = 107397^2 + 122416^2 .

It is a cyclic number.

It is not a de Polignac number, because 26519792665 - 2²³ = 26511404057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26519792669) 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, 2651979262 + ... + 2651979271.

It is an arithmetic number, because the mean of its divisors is an integer number (7955937801).

Almost surely, 2^26519792665 is an apocalyptic number.

It is an amenable number.

26519792665 is a deficient number, since it is larger than the sum of its proper divisors (5303958539).

26519792665 is an equidigital number, since it uses as much as digits as its factorization.

26519792665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303958538.

The product of its digits is 12247200, while the sum is 58.

The spelling of 26519792665 in words is "twenty-six billion, five hundred nineteen million, seven hundred ninety-two thousand, six hundred sixty-five".