858645010161 has 45 divisors (see below), whose sum is σ = 1293205011483. Its totient is φ = 567765346320.

The previous prime is 858645010159. The next prime is 858645010169. The reversal of 858645010161 is 161010546858.

The square root of 858645010161 is 926631.

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

858645010161 is a `hidden beast` number, since 8 + 5 + 86 + 4 + 501 + 0 + 1 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 100596174561 + 758048835600 = 317169^2 + 870660^2 .

It is not a de Polignac number, because 858645010161 - 2¹ = 858645010159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (858645010169) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1242611826 + ... + 1242612516.

Almost surely, 2^858645010161 is an apocalyptic number.

858645010161 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

858645010161 is the 926631-st square number.

858645010161 is the 463316-th centered octagonal number.

It is an amenable number.

858645010161 is a deficient number, since it is larger than the sum of its proper divisors (434560001322).

858645010161 is an frugal number, since it uses more digits than its factorization.

858645010161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 858645010161 in words is "eight hundred fifty-eight billion, six hundred forty-five million, ten thousand, one hundred sixty-one".