85191758287 has 4 divisors (see below), whose sum is σ = 85260629176. Its totient is φ = 85122887400.

The previous prime is 85191758279. The next prime is 85191758291. The reversal of 85191758287 is 78285719158.

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 85191758287 - 2³ = 85191758279 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 (85191758237) 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, 34433589 + ... + 34436062.

It is an arithmetic number, because the mean of its divisors is an integer number (21315157294).

Almost surely, 2^85191758287 is an apocalyptic number.

85191758287 is a deficient number, since it is larger than the sum of its proper divisors (68870889).

85191758287 is a wasteful number, since it uses less digits than its factorization.

85191758287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68870888.

The product of its digits is 11289600, while the sum is 61.

The spelling of 85191758287 in words is "eighty-five billion, one hundred ninety-one million, seven hundred fifty-eight thousand, two hundred eighty-seven".