85871781137 has 16 divisors (see below), whose sum is σ = 88670826192. Its totient is φ = 83122744320.

The previous prime is 85871781133. The next prime is 85871781143. The reversal of 85871781137 is 73118717858.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7538406976 + 78333374161 = 86824^2 + 279881^2 .

It is a cyclic number.

It is not a de Polignac number, because 85871781137 - 2² = 85871781133 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85871781133) 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, 2013923 + ... + 2056119.

It is an arithmetic number, because the mean of its divisors is an integer number (5541926637).

Almost surely, 2^85871781137 is an apocalyptic number.

It is an amenable number.

85871781137 is a deficient number, since it is larger than the sum of its proper divisors (2799045055).

85871781137 is a wasteful number, since it uses less digits than its factorization.

85871781137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42788.

The product of its digits is 2634240, while the sum is 56.

The spelling of 85871781137 in words is "eighty-five billion, eight hundred seventy-one million, seven hundred eighty-one thousand, one hundred thirty-seven".