26206662065 has 4 divisors (see below), whose sum is σ = 31447994484. Its totient is φ = 20965329648.

The previous prime is 26206662059. The next prime is 26206662073. The reversal of 26206662065 is 56026660262.

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 11507281984 + 14699380081 = 107272^2 + 121241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26206662065 is a prime.

It is a super-2 number, since 2×26206662065² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2620666202 + ... + 2620666211.

It is an arithmetic number, because the mean of its divisors is an integer number (7861998621).

Almost surely, 2^26206662065 is an apocalyptic number.

It is an amenable number.

26206662065 is a deficient number, since it is larger than the sum of its proper divisors (5241332419).

26206662065 is an equidigital number, since it uses as much as digits as its factorization.

26206662065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5241332418.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 26206662065 in words is "twenty-six billion, two hundred six million, six hundred sixty-two thousand, sixty-five".