85809503521 has 16 divisors (see below), whose sum is σ = 103382972800. Its totient is φ = 69576288768.

The previous prime is 85809503497. The next prime is 85809503537. The reversal of 85809503521 is 12530590858.

It is not a de Polignac number, because 85809503521 - 2⁵ = 85809503489 is a prime.

It is a super-2 number, since 2×85809503521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85809500521) 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 15 ways as a sum of consecutive naturals, for example, 389826 + ... + 568843.

It is an arithmetic number, because the mean of its divisors is an integer number (6461435800).

Almost surely, 2^85809503521 is an apocalyptic number.

It is an amenable number.

85809503521 is a deficient number, since it is larger than the sum of its proper divisors (17573469279).

85809503521 is a wasteful number, since it uses less digits than its factorization.

85809503521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959368.

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 85809503521 in words is "eighty-five billion, eight hundred nine million, five hundred three thousand, five hundred twenty-one".