85874351991 has 8 divisors (see below), whose sum is σ = 114587831424. Its totient is φ = 57205220280.

The previous prime is 85874351989. The next prime is 85874351999. The reversal of 85874351991 is 19915347858.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85874351991 - 2¹ = 85874351989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85874351999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11082411 + ... + 11090156.

It is an arithmetic number, because the mean of its divisors is an integer number (14323478928).

Almost surely, 2^85874351991 is an apocalyptic number.

85874351991 is a deficient number, since it is larger than the sum of its proper divisors (28713479433).

85874351991 is a wasteful number, since it uses less digits than its factorization.

85874351991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22173861.

The product of its digits is 10886400, while the sum is 60.

The spelling of 85874351991 in words is "eighty-five billion, eight hundred seventy-four million, three hundred fifty-one thousand, nine hundred ninety-one".