258443661 has 16 divisors (see below), whose sum is σ = 394054784. Its totient is φ = 147593664.

The previous prime is 258443611. The next prime is 258443677. The reversal of 258443661 is 166344852.

It is not a de Polignac number, because 258443661 - 2¹⁰ = 258442637 is a prime.

It is a super-2 number, since 2×258443661² = 133586251822165842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258443611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51291 + ... + 56103.

It is an arithmetic number, because the mean of its divisors is an integer number (24628424).

Almost surely, 2^258443661 is an apocalyptic number.

258443661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

258443661 is a deficient number, since it is larger than the sum of its proper divisors (135611123).

258443661 is a wasteful number, since it uses less digits than its factorization.

258443661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380.

The product of its digits is 138240, while the sum is 39.

The square root of 258443661 is about 16076.1830357831. The cubic root of 258443661 is about 636.9743751948.

The spelling of 258443661 in words is "two hundred fifty-eight million, four hundred forty-three thousand, six hundred sixty-one".