85435945391 has 4 divisors (see below), whose sum is σ = 85468896672. Its totient is φ = 85402994112.

The previous prime is 85435945381. The next prime is 85435945403. The reversal of 85435945391 is 19354953458.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85435945391 - 2³⁰ = 84362203567 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 (85435945381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16471751 + ... + 16476936.

It is an arithmetic number, because the mean of its divisors is an integer number (21367224168).

Almost surely, 2^85435945391 is an apocalyptic number.

85435945391 is a deficient number, since it is larger than the sum of its proper divisors (32951281).

85435945391 is a wasteful number, since it uses less digits than its factorization.

85435945391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32951280.

The product of its digits is 11664000, while the sum is 56.

The spelling of 85435945391 in words is "eighty-five billion, four hundred thirty-five million, nine hundred forty-five thousand, three hundred ninety-one".