258568865861 has 2 divisors, whose sum is σ = 258568865862. Its totient is φ = 258568865860.

The previous prime is 258568865827. The next prime is 258568865927. The reversal of 258568865861 is 168568865852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189720353761 + 68848512100 = 435569^2 + 262390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258568865861 is a prime.

It is a super-2 number, since 2×258568865861² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 258568865791 and 258568865800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258568865461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129284432930 + 129284432931.

It is an arithmetic number, because the mean of its divisors is an integer number (129284432931).

Almost surely, 2^258568865861 is an apocalyptic number.

It is an amenable number.

258568865861 is a deficient number, since it is larger than the sum of its proper divisors (1).

258568865861 is an equidigital number, since it uses as much as digits as its factorization.

258568865861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184000, while the sum is 68.

Subtracting from 258568865861 its reverse (168568865852), we obtain a palindrome (90000000009).

The spelling of 258568865861 in words is "two hundred fifty-eight billion, five hundred sixty-eight million, eight hundred sixty-five thousand, eight hundred sixty-one".