258245557 has 2 divisors, whose sum is σ = 258245558. Its totient is φ = 258245556.

The previous prime is 258245503. The next prime is 258245563. The reversal of 258245557 is 755542852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 121682961 = 11686^2 + 11031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258245557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258245597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129122778 + 129122779.

It is an arithmetic number, because the mean of its divisors is an integer number (129122779).

Almost surely, 2^258245557 is an apocalyptic number.

It is an amenable number.

258245557 is a deficient number, since it is larger than the sum of its proper divisors (1).

258245557 is an equidigital number, since it uses as much as digits as its factorization.

258245557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 560000, while the sum is 43.

The square root of 258245557 is about 16070.0204418040. The cubic root of 258245557 is about 636.8115809429.

The spelling of 258245557 in words is "two hundred fifty-eight million, two hundred forty-five thousand, five hundred fifty-seven".