489154638681 has 12 divisors (see below), whose sum is σ = 706574226852. Its totient is φ = 326095003296.

The previous prime is 489154638671. The next prime is 489154638691. The reversal of 489154638681 is 186836451984.

489154638681 is a `hidden beast` number, since 4 + 8 + 9 + 1 + 546 + 3 + 8 + 6 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (489154638671) and next prime (489154638691).

It can be written as a sum of positive squares in 2 ways, for example, as 100257723225 + 388896915456 = 316635^2 + 623616^2 .

It is not a de Polignac number, because 489154638681 - 2¹⁷ = 489154507609 is a prime.

It is a super-2 number, since 2×489154638681² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (489154638671) 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 11 ways as a sum of consecutive naturals, for example, 278926 + ... + 1027671.

It is an arithmetic number, because the mean of its divisors is an integer number (58881185571).

Almost surely, 2^489154638681 is an apocalyptic number.

It is an amenable number.

489154638681 is a deficient number, since it is larger than the sum of its proper divisors (217419588171).

489154638681 is a wasteful number, since it uses less digits than its factorization.

489154638681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348200 (or 1348197 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 63.

The spelling of 489154638681 in words is "four hundred eighty-nine billion, one hundred fifty-four million, six hundred thirty-eight thousand, six hundred eighty-one".