868591084757 has 24 divisors (see below), whose sum is σ = 1014123517848. Its totient is φ = 740804613120.

The previous prime is 868591084741. The next prime is 868591084763. The reversal of 868591084757 is 757480195868.

Added to its reverse (757480195868) it gives a square (1626071280625 = 1275175²).

It can be written as a sum of positive squares in 4 ways, for example, as 238169376676 + 630421708081 = 488026^2 + 793991^2 .

868591084757 is a rare number.

It is not a de Polignac number, because 868591084757 - 2⁴ = 868591084741 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 (868591084357) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30698 + ... + 1318379.

It is an arithmetic number, because the mean of its divisors is an integer number (42255146577).

Almost surely, 2^868591084757 is an apocalyptic number.

It is an amenable number.

868591084757 is a deficient number, since it is larger than the sum of its proper divisors (145532433091).

868591084757 is a wasteful number, since it uses less digits than its factorization.

868591084757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349429 (or 1349418 counting only the distinct ones).

The product of its (nonzero) digits is 135475200, while the sum is 68.

Adding to 868591084757 its reverse (757480195868), we get a square (1626071280625 = 1275175²).

Subtracting from 868591084757 its reverse (757480195868), we obtain a square (111110888889 = 333333²).

The spelling of 868591084757 in words is "eight hundred sixty-eight billion, five hundred ninety-one million, eighty-four thousand, seven hundred fifty-seven".