85533143991 has 16 divisors (see below), whose sum is σ = 114612367200. Its totient is φ = 56738314368.

The previous prime is 85533143959. The next prime is 85533144007. The reversal of 85533143991 is 19934133558.

It is not a de Polignac number, because 85533143991 - 2⁵ = 85533143959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85533143191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1109305 + ... + 1183901.

It is an arithmetic number, because the mean of its divisors is an integer number (7163272950).

Almost surely, 2^85533143991 is an apocalyptic number.

85533143991 is a deficient number, since it is larger than the sum of its proper divisors (29079223209).

85533143991 is a wasteful number, since it uses less digits than its factorization.

85533143991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76498.

The product of its digits is 1749600, while the sum is 51.

The spelling of 85533143991 in words is "eighty-five billion, five hundred thirty-three million, one hundred forty-three thousand, nine hundred ninety-one".