258863661 has 32 divisors (see below), whose sum is σ = 440275200. Its totient is φ = 147251520.

The previous prime is 258863659. The next prime is 258863701. The reversal of 258863661 is 166368852.

258863661 is a `hidden beast` number, since 2 + 5 + 8 + 8 + 636 + 6 + 1 = 666.

It is not a de Polignac number, because 258863661 - 2¹ = 258863659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258863611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40291 + ... + 46271.

It is an arithmetic number, because the mean of its divisors is an integer number (13758600).

Almost surely, 2^258863661 is an apocalyptic number.

258863661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

258863661 is a deficient number, since it is larger than the sum of its proper divisors (181411539).

258863661 is a wasteful number, since it uses less digits than its factorization.

258863661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6226 (or 6220 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 258863661 is about 16089.2405352148. The cubic root of 258863661 is about 637.3192401008.

The spelling of 258863661 in words is "two hundred fifty-eight million, eight hundred sixty-three thousand, six hundred sixty-one".