660899083849 has 45 divisors (see below), whose sum is σ = 734828458377. Its totient is φ = 594382129152.

The previous prime is 660899083783. The next prime is 660899083879. The reversal of 660899083849 is 948380998066.

The square root of 660899083849 is 812957.

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

660899083849 is digitally balanced in base 2, 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 22 ways, for example, as 471907172025 + 188991911824 = 686955^2 + 434732^2 .

It is not a de Polignac number, because 660899083849 - 2⁷ = 660899083721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660899083879) 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, 6813392569 + ... + 6813392665.

Almost surely, 2^660899083849 is an apocalyptic number.

660899083849 is the 812957-th square number.

660899083849 is the 406479-th centered octagonal number.

It is an amenable number.

660899083849 is a deficient number, since it is larger than the sum of its proper divisors (73929374528).

660899083849 is an frugal number, since it uses more digits than its factorization.

660899083849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 70.

The spelling of 660899083849 in words is "six hundred sixty billion, eight hundred ninety-nine million, eighty-three thousand, eight hundred forty-nine".