858639663 has 32 divisors (see below), whose sum is σ = 1484728320. Its totient is φ = 480206880.

The previous prime is 858639641. The next prime is 858639701. The reversal of 858639663 is 366936858.

It is not a de Polignac number, because 858639663 - 2¹⁴ = 858623279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858639563) 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, 39448 + ... + 57213.

It is an arithmetic number, because the mean of its divisors is an integer number (46397760).

Almost surely, 2^858639663 is an apocalyptic number.

858639663 is a deficient number, since it is larger than the sum of its proper divisors (626088657).

858639663 is a wasteful number, since it uses less digits than its factorization.

858639663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96724 (or 96718 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 858639663 is about 29302.5538648084. The cubic root of 858639663 is about 950.4668667403.

The spelling of 858639663 in words is "eight hundred fifty-eight million, six hundred thirty-nine thousand, six hundred sixty-three".