26355012665 has 4 divisors (see below), whose sum is σ = 31626015204. Its totient is φ = 21084010128.

The previous prime is 26355012641. The next prime is 26355012707. The reversal of 26355012665 is 56621055362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56621055362 = 2 ⋅28310527681.

It can be written as a sum of positive squares in 2 ways, for example, as 20754436096 + 5600576569 = 144064^2 + 74837^2 .

It is a cyclic number.

It is not a de Polignac number, because 26355012665 - 2⁶ = 26355012601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2635501262 + ... + 2635501271.

It is an arithmetic number, because the mean of its divisors is an integer number (7906503801).

Almost surely, 2^26355012665 is an apocalyptic number.

It is an amenable number.

26355012665 is a deficient number, since it is larger than the sum of its proper divisors (5271002539).

26355012665 is an equidigital number, since it uses as much as digits as its factorization.

26355012665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5271002538.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 26355012665 in words is "twenty-six billion, three hundred fifty-five million, twelve thousand, six hundred sixty-five".