26565105613 has 4 divisors (see below), whose sum is σ = 26579615968. Its totient is φ = 26550595260.

The previous prime is 26565105583. The next prime is 26565105617. The reversal of 26565105613 is 31650156562.

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 a cyclic number.

It is not a de Polignac number, because 26565105613 - 2²⁵ = 26531551181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26565105617) 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, 7252431 + ... + 7256092.

It is an arithmetic number, because the mean of its divisors is an integer number (6644903992).

Almost surely, 2^26565105613 is an apocalyptic number.

It is an amenable number.

26565105613 is a deficient number, since it is larger than the sum of its proper divisors (14510355).

26565105613 is a wasteful number, since it uses less digits than its factorization.

26565105613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14510354.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 26565105613 in words is "twenty-six billion, five hundred sixty-five million, one hundred five thousand, six hundred thirteen".