666636098 has 6 divisors (see below), whose sum is σ = 1000008921. Its totient is φ = 333299792.

The previous prime is 666636083. The next prime is 666636119. The reversal of 666636098 is 890636666.

666636098 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 2 ways, for example, as 639938209 + 26697889 = 25297^2 + 5167^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18257.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 27386 + ... + 45642.

Almost surely, 2^666636098 is an apocalyptic number.

666636098 is a deficient number, since it is larger than the sum of its proper divisors (333372823).

666636098 is an frugal number, since it uses more digits than its factorization.

666636098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36516 (or 18259 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 50.

The square root of 666636098 is about 25819.2970082456. The cubic root of 666636098 is about 873.5671124372.

Multiplying 666636098 by its sum of digits (50), we get a square (33331804900 = 182570²).

The spelling of 666636098 in words is "six hundred sixty-six million, six hundred thirty-six thousand, ninety-eight".