858418927081 has 9 divisors (see below), whose sum is σ = 897386486269. Its totient is φ = 821075981836.

The previous prime is 858418927073. The next prime is 858418927087. The reversal of 858418927081 is 180729814858.

The square root of 858418927081 is 926509.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 858418927081 - 2³ = 858418927073 is a prime.

It is a super-2 number, since 2×858418927081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858418927087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21289566 + ... + 21329848.

Almost surely, 2^858418927081 is an apocalyptic number.

858418927081 is the 926509-th square number.

858418927081 is the 463255-th centered octagonal number.

It is an amenable number.

858418927081 is a deficient number, since it is larger than the sum of its proper divisors (38967559188).

858418927081 is an frugal number, since it uses more digits than its factorization.

858418927081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80612 (or 40306 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 61.

The spelling of 858418927081 in words is "eight hundred fifty-eight billion, four hundred eighteen million, nine hundred twenty-seven thousand, eighty-one".