489784644865 has 16 divisors (see below), whose sum is σ = 608037140880. Its totient is φ = 378298609920.

The previous prime is 489784644841. The next prime is 489784644913. The reversal of 489784644865 is 568446487984.

It can be written as a sum of positive squares in 8 ways, for example, as 142497190144 + 347287454721 = 377488^2 + 589311^2 .

It is not a de Polignac number, because 489784644865 - 2⁷ = 489784644737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3595987 + ... + 3729703.

It is an arithmetic number, because the mean of its divisors is an integer number (38002321305).

Almost surely, 2^489784644865 is an apocalyptic number.

It is an amenable number.

489784644865 is a deficient number, since it is larger than the sum of its proper divisors (118252496015).

489784644865 is a wasteful number, since it uses less digits than its factorization.

489784644865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159012.

The product of its digits is 1486356480, while the sum is 73.

The spelling of 489784644865 in words is "four hundred eighty-nine billion, seven hundred eighty-four million, six hundred forty-four thousand, eight hundred sixty-five".