258845661 has 12 divisors (see below), whose sum is σ = 376579840. Its totient is φ = 171321480.

The previous prime is 258845647. The next prime is 258845707. The reversal of 258845661 is 166548852.

258845661 is a `hidden beast` number, since 2 + 5 + 8 + 84 + 566 + 1 = 666.

It is not a de Polignac number, because 258845661 - 2¹⁹ = 258321373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258845161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102205 + ... + 104706.

Almost surely, 2^258845661 is an apocalyptic number.

It is an amenable number.

258845661 is a deficient number, since it is larger than the sum of its proper divisors (117734179).

258845661 is a wasteful number, since it uses less digits than its factorization.

258845661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207056 (or 207053 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 258845661 is about 16088.6811454513. The cubic root of 258845661 is about 637.3044678301.

The spelling of 258845661 in words is "two hundred fifty-eight million, eight hundred forty-five thousand, six hundred sixty-one".