258577661 has 4 divisors (see below), whose sum is σ = 269820192. Its totient is φ = 247335132.

The previous prime is 258577651. The next prime is 258577673. The reversal of 258577661 is 166775852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 258577661 - 2¹⁸ = 258315517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258577621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5621231 + ... + 5621276.

It is an arithmetic number, because the mean of its divisors is an integer number (67455048).

Almost surely, 2^258577661 is an apocalyptic number.

It is an amenable number.

258577661 is a deficient number, since it is larger than the sum of its proper divisors (11242531).

258577661 is a wasteful number, since it uses less digits than its factorization.

258577661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11242530.

The product of its digits is 705600, while the sum is 47.

The square root of 258577661 is about 16080.3501516603. The cubic root of 258577661 is about 637.0844440823.

The spelling of 258577661 in words is "two hundred fifty-eight million, five hundred seventy-seven thousand, six hundred sixty-one".