809502954518 has 64 divisors (see below), whose sum is σ = 1331770118400. Its totient is φ = 367586519040.

The previous prime is 809502954517. The next prime is 809502954539. The reversal of 809502954518 is 815459205908.

It is a happy number.

It is a super-2 number, since 2×809502954518² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809502954517) 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 31 ways as a sum of consecutive naturals, for example, 25708088 + ... + 25739556.

It is an arithmetic number, because the mean of its divisors is an integer number (20808908100).

Almost surely, 2^809502954518 is an apocalyptic number.

809502954518 is a deficient number, since it is larger than the sum of its proper divisors (522267163882).

809502954518 is a wasteful number, since it uses less digits than its factorization.

809502954518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31785.

The product of its (nonzero) digits is 5184000, while the sum is 56.

The spelling of 809502954518 in words is "eight hundred nine billion, five hundred two million, nine hundred fifty-four thousand, five hundred eighteen".