258161636 has 12 divisors (see below), whose sum is σ = 451925628. Its totient is φ = 129040032.

The previous prime is 258161633. The next prime is 258161669. The reversal of 258161636 is 636161852.

It can be written as a sum of positive squares in 2 ways, for example, as 150209536 + 107952100 = 12256^2 + 10390^2 .

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 258161636.

It is not an unprimeable number, because it can be changed into a prime (258161633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7430 + ... + 23906.

It is an arithmetic number, because the mean of its divisors is an integer number (37660469).

Almost surely, 2^258161636 is an apocalyptic number.

It is an amenable number.

258161636 is a deficient number, since it is larger than the sum of its proper divisors (193763992).

258161636 is a wasteful number, since it uses less digits than its factorization.

258161636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20398 (or 20396 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 258161636 is about 16067.4091253070. The cubic root of 258161636 is about 636.7425927865.

The spelling of 258161636 in words is "two hundred fifty-eight million, one hundred sixty-one thousand, six hundred thirty-six".