66298189 has 4 divisors (see below), whose sum is σ = 67915260. Its totient is φ = 64681120.

The previous prime is 66298187. The next prime is 66298207. The reversal of 66298189 is 98189266.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18922500 + 47375689 = 4350^2 + 6883^2 .

It is a cyclic number.

It is not a de Polignac number, because 66298189 - 2¹ = 66298187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66298187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808474 + ... + 808555.

It is an arithmetic number, because the mean of its divisors is an integer number (16978815).

Almost surely, 2^66298189 is an apocalyptic number.

It is an amenable number.

66298189 is a deficient number, since it is larger than the sum of its proper divisors (1617071).

66298189 is a wasteful number, since it uses less digits than its factorization.

66298189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617070.

The product of its digits is 373248, while the sum is 49.

The square root of 66298189 is about 8142.3699866808. The cubic root of 66298189 is about 404.7317005701.

The spelling of 66298189 in words is "sixty-six million, two hundred ninety-eight thousand, one hundred eighty-nine".