858993663 has 32 divisors (see below), whose sum is σ = 1365645312. Its totient is φ = 474163200.

The previous prime is 858993617. The next prime is 858993679. The reversal of 858993663 is 366399858.

It is not a de Polignac number, because 858993663 - 2⁸ = 858993407 is a prime.

It is a super-2 number, since 2×858993663² = 1475740226148315138, which contains 22 as substring.

It is a plaindrome in base 16.

It is a zygodrome in base 2 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858993683) 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, 7306 + ... + 42087.

It is an arithmetic number, because the mean of its divisors is an integer number (42676416).

Almost surely, 2^858993663 is an apocalyptic number.

858993663 is a deficient number, since it is larger than the sum of its proper divisors (506651649).

858993663 is a wasteful number, since it uses less digits than its factorization.

858993663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49455.

The product of its digits is 8398080, while the sum is 57.

The square root of 858993663 is about 29308.5936714814. The cubic root of 858993663 is about 950.5974683017.

The spelling of 858993663 in words is "eight hundred fifty-eight million, nine hundred ninety-three thousand, six hundred sixty-three".