258423537217 has 2 divisors, whose sum is σ = 258423537218. Its totient is φ = 258423537216.

The previous prime is 258423537191. The next prime is 258423537233. The reversal of 258423537217 is 712735324852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231287893776 + 27135643441 = 480924^2 + 164729^2 .

It is a cyclic number.

It is not a de Polignac number, because 258423537217 - 2²⁷ = 258289319489 is a prime.

It is not a weakly prime, because it can be changed into another prime (258423517217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129211768608 + 129211768609.

It is an arithmetic number, because the mean of its divisors is an integer number (129211768609).

Almost surely, 2^258423537217 is an apocalyptic number.

It is an amenable number.

258423537217 is a deficient number, since it is larger than the sum of its proper divisors (1).

258423537217 is an equidigital number, since it uses as much as digits as its factorization.

258423537217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 49.

The spelling of 258423537217 in words is "two hundred fifty-eight billion, four hundred twenty-three million, five hundred thirty-seven thousand, two hundred seventeen".