485866155681 has 45 divisors (see below), whose sum is σ = 744328299913. Its totient is φ = 315843217920.

The previous prime is 485866155637. The next prime is 485866155713. The reversal of 485866155681 is 186551668584.

The square root of 485866155681 is 697041.

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

485866155681 is a `hidden beast` number, since 4 + 8 + 5 + 8 + 6 + 61 + 5 + 568 + 1 = 666.

485866155681 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 147002461281 + 338863694400 = 383409^2 + 582120^2 .

It is not a de Polignac number, because 485866155681 - 2¹⁹ = 485865631393 is a prime.

It is a super-2 number, since 2×485866155681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (485886155681) 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, 257207185 + ... + 257209073.

Almost surely, 2^485866155681 is an apocalyptic number.

485866155681 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

485866155681 is the 697041-st square number.

485866155681 is the 348521-st centered octagonal number.

It is an amenable number.

485866155681 is a deficient number, since it is larger than the sum of its proper divisors (258462144232).

485866155681 is an frugal number, since it uses more digits than its factorization.

485866155681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872 (or 1933 counting only the distinct ones).

The product of its digits is 55296000, while the sum is 63.

The spelling of 485866155681 in words is "four hundred eighty-five billion, eight hundred sixty-six million, one hundred fifty-five thousand, six hundred eighty-one".