258671661 has 4 divisors (see below), whose sum is σ = 344895552. Its totient is φ = 172447772.

The previous prime is 258671653. The next prime is 258671663. The reversal of 258671661 is 166176852.

258671661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 258671661 - 2³ = 258671653 is a prime.

It is a super-3 number, since 3×258671661³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258671663) 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, 43111941 + ... + 43111946.

It is an arithmetic number, because the mean of its divisors is an integer number (86223888).

Almost surely, 2^258671661 is an apocalyptic number.

It is an amenable number.

258671661 is a deficient number, since it is larger than the sum of its proper divisors (86223891).

258671661 is an equidigital number, since it uses as much as digits as its factorization.

258671661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86223890.

The product of its digits is 120960, while the sum is 42.

The square root of 258671661 is about 16083.2727080032. The cubic root of 258671661 is about 637.1616338934.

It can be divided in two parts, 2586 and 71661, that added together give a palindrome (74247).

The spelling of 258671661 in words is "two hundred fifty-eight million, six hundred seventy-one thousand, six hundred sixty-one".