858685028129 has 4 divisors (see below), whose sum is σ = 858695086080. Its totient is φ = 858674970180.

The previous prime is 858685028099. The next prime is 858685028213. The reversal of 858685028129 is 921820586858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 858685028129 - 2²⁰ = 858683979553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858685828129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4899809 + ... + 5072030.

It is an arithmetic number, because the mean of its divisors is an integer number (214673771520).

Almost surely, 2^858685028129 is an apocalyptic number.

It is an amenable number.

858685028129 is a deficient number, since it is larger than the sum of its proper divisors (10057951).

858685028129 is an equidigital number, since it uses as much as digits as its factorization.

858685028129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057950.

The product of its (nonzero) digits is 22118400, while the sum is 62.

The spelling of 858685028129 in words is "eight hundred fifty-eight billion, six hundred eighty-five million, twenty-eight thousand, one hundred twenty-nine".