656849889 has 12 divisors (see below), whose sum is σ = 971924772. Its totient is φ = 427219200.

The previous prime is 656849887. The next prime is 656849899. The reversal of 656849889 is 988948656.

656849889 is a `hidden beast` number, since 6 + 5 + 68 + 498 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 107744400 + 549105489 = 10380^2 + 23433^2 .

It is not a de Polignac number, because 656849889 - 2¹ = 656849887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656849887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 889672 + ... + 890409.

It is an arithmetic number, because the mean of its divisors is an integer number (80993731).

Almost surely, 2^656849889 is an apocalyptic number.

It is an amenable number.

656849889 is a deficient number, since it is larger than the sum of its proper divisors (315074883).

656849889 is a wasteful number, since it uses less digits than its factorization.

656849889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780128 (or 1780125 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The square root of 656849889 is about 25629.0828747343. The cubic root of 656849889 is about 869.2713717091.

The spelling of 656849889 in words is "six hundred fifty-six million, eight hundred forty-nine thousand, eight hundred eighty-nine".