258166505 has 16 divisors (see below), whose sum is σ = 328406400. Its totient is φ = 194157312.

The previous prime is 258166459. The next prime is 258166529. The reversal of 258166505 is 505661852.

It is a cyclic number.

It is not a de Polignac number, because 258166505 - 2²⁴ = 241389289 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 121946 + ... + 124044.

It is an arithmetic number, because the mean of its divisors is an integer number (20525400).

Almost surely, 2^258166505 is an apocalyptic number.

It is an amenable number.

258166505 is a deficient number, since it is larger than the sum of its proper divisors (70239895).

258166505 is a wasteful number, since it uses less digits than its factorization.

258166505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3568.

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 258166505 is about 16067.5606424871. The cubic root of 258166505 is about 636.7465958086.

The spelling of 258166505 in words is "two hundred fifty-eight million, one hundred sixty-six thousand, five hundred five".