258534875821 has 2 divisors, whose sum is σ = 258534875822. Its totient is φ = 258534875820.

The previous prime is 258534875801. The next prime is 258534875827. The reversal of 258534875821 is 128578435852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217706228100 + 40828647721 = 466590^2 + 202061^2 .

It is a cyclic number.

It is not a de Polignac number, because 258534875821 - 2⁷ = 258534875693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258534875827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129267437910 + 129267437911.

It is an arithmetic number, because the mean of its divisors is an integer number (129267437911).

Almost surely, 2^258534875821 is an apocalyptic number.

It is an amenable number.

258534875821 is a deficient number, since it is larger than the sum of its proper divisors (1).

258534875821 is an equidigital number, since it uses as much as digits as its factorization.

258534875821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504000, while the sum is 58.

The spelling of 258534875821 in words is "two hundred fifty-eight billion, five hundred thirty-four million, eight hundred seventy-five thousand, eight hundred twenty-one".