826426008509 has 4 divisors (see below), whose sum is σ = 869922114240. Its totient is φ = 782929902780.

The previous prime is 826426008503. The next prime is 826426008511. The reversal of 826426008509 is 905800624628.

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 826426008509 - 2⁸ = 826426008253 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 (826426008503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21748052837 + ... + 21748052874.

It is an arithmetic number, because the mean of its divisors is an integer number (217480528560).

Almost surely, 2^826426008509 is an apocalyptic number.

It is an amenable number.

826426008509 is a deficient number, since it is larger than the sum of its proper divisors (43496105731).

826426008509 is a wasteful number, since it uses less digits than its factorization.

826426008509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43496105730.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 826426008509 in words is "eight hundred twenty-six billion, four hundred twenty-six million, eight thousand, five hundred nine".