258427661 has 4 divisors (see below), whose sum is σ = 258563424. Its totient is φ = 258291900.

The previous prime is 258427639. The next prime is 258427679. The reversal of 258427661 is 166724852.

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 a de Polignac number, because none of the positive numbers 2^k-258427661 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 (258427681) 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, 64985 + ... + 68846.

It is an arithmetic number, because the mean of its divisors is an integer number (64640856).

Almost surely, 2^258427661 is an apocalyptic number.

It is an amenable number.

258427661 is a deficient number, since it is larger than the sum of its proper divisors (135763).

258427661 is a wasteful number, since it uses less digits than its factorization.

258427661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135762.

The product of its digits is 161280, while the sum is 41.

The square root of 258427661 is about 16075.6853975188. The cubic root of 258427661 is about 636.9612300986.

The spelling of 258427661 in words is "two hundred fifty-eight million, four hundred twenty-seven thousand, six hundred sixty-one".