85511307529 has 4 divisors (see below), whose sum is σ = 85512049920. Its totient is φ = 85510565140.

The previous prime is 85511307499. The next prime is 85511307617. The reversal of 85511307529 is 92570311558.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92570311558 = 2 ⋅46285155779.

It is a cyclic number.

It is not a de Polignac number, because 85511307529 - 2¹³ = 85511299337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85511337529) by changing a digit.

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, 157357 + ... + 442474.

It is an arithmetic number, because the mean of its divisors is an integer number (21378012480).

Almost surely, 2^85511307529 is an apocalyptic number.

It is an amenable number.

85511307529 is a deficient number, since it is larger than the sum of its proper divisors (742391).

85511307529 is a wasteful number, since it uses less digits than its factorization.

85511307529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742390.

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 85511307529 in words is "eighty-five billion, five hundred eleven million, three hundred seven thousand, five hundred twenty-nine".