858601820161 has 4 divisors (see below), whose sum is σ = 858625583152. Its totient is φ = 858578057172.

The previous prime is 858601820143. The next prime is 858601820231. The reversal of 858601820161 is 161028106858.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161028106858 = 2 ⋅80514053429.

It is a cyclic number.

It is not a de Polignac number, because 858601820161 - 2²⁹ = 858064949249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858601824161) 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, 11827215 + ... + 11899588.

It is an arithmetic number, because the mean of its divisors is an integer number (214656395788).

Almost surely, 2^858601820161 is an apocalyptic number.

It is an amenable number.

858601820161 is a deficient number, since it is larger than the sum of its proper divisors (23762991).

858601820161 is a wasteful number, since it uses less digits than its factorization.

858601820161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23762990.

The product of its (nonzero) digits is 184320, while the sum is 46.

The spelling of 858601820161 in words is "eight hundred fifty-eight billion, six hundred one million, eight hundred twenty thousand, one hundred sixty-one".